feat: Add HandBrakeCLI and ffmsindex to required tools and remove mkvpropedit.

MkvOpusEnc.py

@@ -32,7 +32,7 @@ class Tee:
 
 def check_tools():
     """Checks if all required command-line tools are in the system's PATH."""
-    required_tools = ["ffmpeg", "ffprobe", "mkvmerge", "sox", "opusenc", "mediainfo"]
+    required_tools = ["ffmpeg", "ffprobe", "mkvmerge", "sox_ng", "opusenc", "mediainfo"]
     print("--- Prerequisite Check ---")
     all_found = True
     for tool in required_tools:
@@ -78,14 +78,16 @@ def convert_audio_track(stream_index, channels, temp_dir, source_file, should_do
     ffmpeg_args.extend(["-c:a", "flac", str(temp_extracted)])
     run_cmd(ffmpeg_args)
 
-    # Step 2: Normalize the track with SoX
+    # Step 2: Normalize the track with SoX NG
     print("    - Normalizing with SoX...")
-    run_cmd(["sox", str(temp_extracted), str(temp_normalized), "-S", "--temp", str(temp_dir), "--guard", "gain", "-n"])
+    run_cmd(["sox_ng", str(temp_extracted), str(temp_normalized), "-S", "--temp", str(temp_dir), "--guard", "gain", "-n"])
 
     # Step 3: Encode to Opus with the correct bitrate
     bitrate = "192k"  # Fallback
     
-    if final_channels == 2:
+    if final_channels == 1:
+        bitrate = "64k"
+    elif final_channels == 2:
         bitrate = "128k"
     elif final_channels == 6:
         bitrate = "256k"

README_MkvOpusEnc.md

@@ -11,7 +11,7 @@
     *   Remuxes existing `AAC` and `Opus` tracks without re-encoding to preserve quality.
     *   Re-encodes all other audio formats (DTS, AC3, TrueHD, FLAC, etc.) to Opus.
 *   **Advanced Downmixing:** Includes an optional `--downmix` flag that converts multi-channel audio (5.1, 7.1) to stereo using a dialogue-boosting formula.
-*   **Audio Normalization:** Uses `SoX` to normalize audio levels for a consistent listening experience.
+*   **Audio Normalization:** Uses a 2-pass `ffmpeg` loudnorm process (EBU R128) to normalize audio levels for a consistent and standard-compliant listening experience.
 *   **Metadata Preservation:** Carefully preserves audio track metadata such as titles, language tags, and delay/sync information.
 *   **Detailed Logging:** Creates a separate, detailed log file for each processed MKV in the `conv_logs/` directory, capturing the full terminal output and conversion details for easy review.
 *   **File Organization:** Automatically moves the original source files to an `original/` directory and the newly processed files to a `completed/` directory, keeping your workspace clean.
@@ -24,7 +24,6 @@ The following command-line tools must be installed and available in your system'
 *   `ffmpeg`
 *   `ffprobe`
 *   `mkvmerge`
-*   `sox`
 *   `opusenc`
 *   `mediainfo`
 

anime_audio_encoder.py

@@ -11,7 +11,7 @@ from pathlib import Path
 
 REQUIRED_TOOLS = [
     "ffmpeg", "ffprobe", "mkvmerge", "mkvpropedit",
-    "sox", "opusenc", "mediainfo", "av1an", "HandBrakeCLI" # Added HandBrakeCLI
+    "sox_ng", "opusenc", "mediainfo", "av1an", "HandBrakeCLI" # Added HandBrakeCLI
 ]
 DIR_COMPLETED = Path("completed")
 DIR_ORIGINAL = Path("original")
@@ -19,6 +19,21 @@ DIR_CONV_LOGS = Path("conv_logs") # Directory for conversion logs
 
 REMUX_CODECS = {"aac", "opus"}  # Using a set for efficient lookups
 
+SVT_AV1_PARAMS = {
+    "speed": "slower",  # "slower", "slow", "medium", "fast", "faster"
+    "quality": "medium",  # "higher", "high", "medium", "low", "lower"
+    "film-grain": 6,
+    "color-primaries": 1,
+    "transfer-characteristics": 1,
+    "matrix-coefficients": 1,
+    "scd": 0,  # Scene change detection OFF for Av1an use
+    "keyint": 0,  # Keyframe interval, 0 disables automatic keyframes placement at a constant interval
+    "lp": 2, # Level of parallelism
+    "auto-tiling": 1,  # Auto tiling ON
+    "tune": 1,  # 0 = VQ, 1 = PSNR, 2 = SSIM
+    "progress": 2,  # Detailed progress output
+}
+
 def check_tools():
     for tool in REQUIRED_TOOLS:
         if shutil.which(tool) is None:
@@ -40,7 +55,7 @@ def convert_audio_track(index, ch, lang, audio_temp_dir, source_file, should_dow
 
     print(f"    - Extracting Audio Track #{index} to FLAC...")
     ffmpeg_args = [
-        "ffmpeg", "-v", "quiet", "-stats", "-y", "-i", str(source_file), "-map", f"0:{index}"
+        "ffmpeg", "-v", "quiet", "-stats", "-y", "-i", str(source_file), "-map", f"0:{index}", "-map_metadata", "-1"
     ]
     if should_downmix and ch >= 6:
         if ch == 6:
@@ -54,7 +69,7 @@ def convert_audio_track(index, ch, lang, audio_temp_dir, source_file, should_dow
 
     print(f"    - Normalizing Audio Track #{index} with SoX...")
     run_cmd([
-        "sox", str(temp_extracted), str(temp_normalized), "-S", "--temp", str(audio_temp_path), "--guard", "gain", "-n"
+        "sox_ng", str(temp_extracted), str(temp_normalized), "-S", "--temp", str(audio_temp_path), "--guard", "gain", "-n"
     ])
 
     # Set bitrate based on the final channel count of the Opus file.
@@ -68,14 +83,16 @@ def convert_audio_track(index, ch, lang, audio_temp_dir, source_file, should_dow
     else:
         # Not downmixing (or source is already stereo or less).
         # Base bitrate on the source channel count.
-        if ch == 2:      # Stereo
+        if ch == 1:      # Mono
+            bitrate = "64k"
+        elif ch == 2:    # Stereo
             bitrate = "128k"
         elif ch == 6:    # 5.1 Surround
             bitrate = "256k"
         elif ch == 8:    # 7.1 Surround
             bitrate = "384k"
-        else:            # Mono or other layouts
-            bitrate = "96k" # A sensible default for mono.
+        else:            # Other layouts
+            bitrate = "96k" # A sensible default for other/uncommon layouts.
 
     print(f"    - Encoding Audio Track #{index} to Opus at {bitrate}...")
     run_cmd([
@@ -170,28 +187,17 @@ clip.set_output()
 
     print("    - Starting AV1 encode with av1an (this will take a long time)...")
     total_cores = os.cpu_count() or 4 # Fallback if cpu_count is None
-    workers = max(total_cores - 2, 1) # Ensure at least 1 worker
-    print(f"    - Using {workers} workers for av1an (Total Cores: {total_cores}).")
+    workers = max(1, (total_cores // 2) - 1) # Half the cores minus one, with a minimum of 1 worker.
+    print(f"    - Using {workers} workers for av1an (Total Cores: {total_cores}, Logic: (Cores/2)-1).")
 
-    svt_av1_params = {
-        "preset": 2,
-        "crf": 27,
-        "film-grain": 6,
-        "lp": 1,
-        "tune": 1,
-        "keyint": -1,
-        "color-primaries": 1,
-        "transfer-characteristics": 1,
-        "matrix-coefficients": 1,
-    }
     # Create the parameter string for av1an's -v option, which expects a single string.
-    av1an_video_params_str = " ".join([f"--{key} {value}" for key, value in svt_av1_params.items()])
+    av1an_video_params_str = " ".join([f"--{key} {value}" for key, value in SVT_AV1_PARAMS.items()])
     print(f"    - Using SVT-AV1 parameters: {av1an_video_params_str}")
 
     av1an_enc_args = [
         "av1an", "-i", str(vpy_file), "-o", str(encoded_video_file), "-s", str(scene_file), "-n",
         "-e", "svt-av1", "--resume", "--sc-pix-format", "yuv420p", "-c", "mkvmerge",
-        "--set-thread-affinity", "1", "--pix-format", "yuv420p10le", "--force",
+        "--set-thread-affinity", "2", "--pix-format", "yuv420p10le", "--force",
         "-w", str(workers),
         "-v", av1an_video_params_str
     ]
@@ -270,17 +276,21 @@ def _snap_to_known_ar_cropdetect(w, h, x, y, video_w, video_h, tolerance=0.03):
         new_h = round(video_w / best_match['ratio'])
         if new_h % 8 != 0:
             new_h = new_h + (8 - (new_h % 8))
+        new_h = min(new_h, video_h)
         new_y = round((video_h - new_h) / 2)
         if new_y % 2 != 0:
             new_y -= 1
+        new_y = max(0, new_y)
         return f"crop={video_w}:{new_h}:0:{new_y}", best_match['name']
     if abs(h - video_h) < 16:
         new_w = round(video_h * best_match['ratio'])
         if new_w % 8 != 0:
             new_w = new_w + (8 - (new_w % 8))
+        new_w = min(new_w, video_w)
         new_x = round((video_w - new_w) / 2)
         if new_x % 2 != 0:
             new_x -= 1
+        new_x = max(0, new_x)
         return f"crop={new_w}:{video_h}:{new_x}:0", best_match['name']
     return f"crop={w}:{h}:{x}:{y}", None
 
@@ -433,8 +443,17 @@ def detect_autocrop_filter(input_file, significant_crop_threshold=5.0, min_crop=
         return None
     return _analyze_video_cropdetect(input_file, duration, width, height, max(1, os.cpu_count() // 2), significant_crop_threshold, min_crop, debug)
 
-def main(no_downmix=False, autocrop=False):
+def main(no_downmix=False, autocrop=False, speed=None, quality=None, grain=None):
     check_tools()
+
+    # Override default SVT-AV1 params if provided via command line
+    if speed:
+        SVT_AV1_PARAMS["speed"] = speed
+    if quality:
+        SVT_AV1_PARAMS["quality"] = quality
+    if grain is not None:
+        SVT_AV1_PARAMS["film-grain"] = grain
+
     current_dir = Path(".")
     files_to_process = sorted(
         f for f in current_dir.glob("*.mkv")
@@ -720,5 +739,8 @@ if __name__ == "__main__":
     parser = argparse.ArgumentParser(description="Batch-process MKV files with resumable video encoding, audio downmixing, per-file logging, and optional autocrop.")
     parser.add_argument("--no-downmix", action="store_true", help="Preserve original audio channel layout.")
     parser.add_argument("--autocrop", action="store_true", help="Automatically detect and crop black bars from video using cropdetect.")
+    parser.add_argument("--speed", type=str, help="Set the encoding speed. Possible values: slower, slow, medium, fast, faster.")
+    parser.add_argument("--quality", type=str, help="Set the encoding quality. Possible values: lowest, low, medium, high, higher.")
+    parser.add_argument("--grain", type=int, help="Set the film-grain value (number). Adjusts the film grain synthesis level.")
     args = parser.parse_args()
-    main(no_downmix=args.no_downmix, autocrop=args.autocrop)
+    main(no_downmix=args.no_downmix, autocrop=args.autocrop, speed=args.speed, quality=args.quality, grain=args.grain)

av1_opus_encoder.py

@@ -0,0 +1,800 @@
+#!/usr/bin/env python3
+import os
+import argparse
+import sys
+import subprocess
+import shutil
+import tempfile
+import json
+import re
+import logging
+from datetime import datetime
+from pathlib import Path
+from typing import List, Optional, Dict, Any, Union
+
+REQUIRED_TOOLS = [
+    "ffmpeg", "ffprobe", "mkvmerge",
+    "opusenc", "mediainfo", "av1an", "HandBrakeCLI", "ffmsindex" # Added HandBrakeCLI and ffmsindex
+]
+DIR_COMPLETED = Path("completed")
+DIR_ORIGINAL = Path("original")
+DIR_CONV_LOGS = Path("conv_logs") # Directory for conversion logs
+
+REMUX_CODECS = {"aac", "opus"}  # Using a set for efficient lookups
+
+SVT_AV1_PARAMS = {
+    "speed": "slower",  # "slower", "slow", "medium", "fast", "faster"
+    "quality": "medium",  # "higher", "high", "medium", "low", "lower"
+    "film-grain": 6,
+    "color-primaries": 1,
+    "transfer-characteristics": 1,
+    "matrix-coefficients": 1,
+    "scd": 0,  # Scene change detection OFF for Av1an use
+    "keyint": 0,  # Keyframe interval, 0 disables automatic keyframes placement at a constant interval
+    "lp": 2, # Level of parallelism
+    "auto-tiling": 1,  # Auto tiling ON
+    "tune": 1,  # 0 = VQ, 1 = PSNR, 2 = SSIM
+    "progress": 2,  # Detailed progress output
+}
+
+def check_tools() -> None:
+    for tool in REQUIRED_TOOLS:
+        if shutil.which(tool) is None:
+            print(f"Required tool '{tool}' not found in PATH.")
+            sys.exit(1)
+
+def setup_logging(log_file: Path) -> None:
+    """Configures logging to write to both the console and a log file."""
+    logger = logging.getLogger()
+    logger.setLevel(logging.INFO)
+    
+    # Clear existing handlers to avoid duplicates when processing multiple files
+    if logger.hasHandlers():
+        logger.handlers.clear()
+        
+    # File Handler
+    fh = logging.FileHandler(log_file, mode='w', encoding='utf-8')
+    fh.setFormatter(logging.Formatter('%(message)s'))
+    logger.addHandler(fh)
+    
+    # Console Handler
+    ch = logging.StreamHandler(sys.stdout)
+    ch.setFormatter(logging.Formatter('%(message)s'))
+    logger.addHandler(ch)
+
+def run_cmd(cmd: List[str], capture_output: bool = False, check: bool = True) -> Optional[str]:
+    """
+    Runs a command.
+    If capture_output is True, returns the stdout string.
+    If capture_output is False, streams output to the console (passthrough).
+    Always logs the command execution.
+    """
+    cmd_str = " ".join(str(c) for c in cmd)
+    logging.info(f"Executing: {cmd_str}")
+    
+    if capture_output:
+        result = subprocess.run(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, check=check, text=True)
+        return result.stdout
+    else:
+        # Passthrough to console
+        subprocess.run(cmd, check=check)
+        return None
+
+def convert_audio_track(index: int, ch: int, lang: str, audio_temp_dir: str, source_file: str, should_downmix: bool) -> Path:
+    audio_temp_path = Path(audio_temp_dir)
+    temp_extracted = audio_temp_path / f"track_{index}_extracted.flac"
+    temp_normalized = audio_temp_path / f"track_{index}_normalized.flac"
+    final_opus = audio_temp_path / f"track_{index}_final.opus"
+
+    logging.info(f"    - Extracting Audio Track #{index} to FLAC...")
+    ffmpeg_args = [
+        "ffmpeg", "-v", "quiet", "-stats", "-y", "-i", str(source_file), "-map", f"0:{index}", "-map_metadata", "-1"
+    ]
+    if should_downmix and ch >= 6:
+        if ch == 6:
+            ffmpeg_args += ["-af", "pan=stereo|c0=c2+0.30*c0+0.30*c4|c1=c2+0.30*c1+0.30*c5"]
+        elif ch == 8:
+            ffmpeg_args += ["-af", "pan=stereo|c0=c2+0.30*c0+0.30*c4+0.30*c6|c1=c2+0.30*c1+0.30*c5+0.30*c7"]
+        else: # Other multi-channel (e.g. 7ch, 10ch)
+            ffmpeg_args += ["-ac", "2"]
+    ffmpeg_args += ["-c:a", "flac", str(temp_extracted)]
+    run_cmd(ffmpeg_args)
+
+    logging.info(f"    - Normalizing Audio Track #{index} with ffmpeg (loudnorm 2-pass)...")
+    # First pass: Analyze the audio to get loudnorm stats
+    # The stats are printed to stderr, so we must use subprocess.run directly to capture it.
+    logging.info("      - Pass 1: Analyzing...")
+    # Log the command for consistency
+    analyze_cmd = ["ffmpeg", "-v", "info", "-i", str(temp_extracted), "-af", "loudnorm=I=-23:LRA=7:tp=-1:print_format=json", "-f", "null", "-"]
+    logging.info(f"Executing: {' '.join(analyze_cmd)}")
+    
+    result = subprocess.run(
+        analyze_cmd,
+        capture_output=True, text=True, check=True)
+    
+    # Find the start of the JSON block in stderr and parse it.
+    stderr_output = result.stderr
+    json_start_index = stderr_output.find('{')
+    if json_start_index == -1:
+        raise ValueError("Could not find start of JSON block in ffmpeg output for loudnorm analysis.")
+
+    brace_level = 0
+    json_end_index = -1
+    for i, char in enumerate(stderr_output[json_start_index:]):
+        if char == '{':
+            brace_level += 1
+        elif char == '}':
+            brace_level -= 1
+            if brace_level == 0:
+                json_end_index = json_start_index + i + 1
+                break
+    
+    stats = json.loads(stderr_output[json_start_index:json_end_index])
+
+    # Second pass: Apply the normalization using the stats from the first pass
+    logging.info("      - Pass 2: Applying normalization...")
+    run_cmd([
+        "ffmpeg", "-v", "quiet", "-stats", "-y", "-i", str(temp_extracted), "-af",
+        f"loudnorm=I=-23:LRA=7:tp=-1:measured_i={stats['input_i']}:measured_lra={stats['input_lra']}:measured_tp={stats['input_tp']}:measured_thresh={stats['input_thresh']}:offset={stats['target_offset']}",
+        "-c:a", "flac", str(temp_normalized)
+    ])
+
+    # Set bitrate based on the final channel count of the Opus file.
+    is_being_downmixed = should_downmix and ch >= 6
+
+    if is_being_downmixed:
+        bitrate = "128k"
+    else:
+        if ch == 1:      # Mono
+            bitrate = "64k"
+        elif ch == 2:    # Stereo
+            bitrate = "128k"
+        elif ch == 6:    # 5.1 Surround
+            bitrate = "256k"
+        elif ch == 8:    # 7.1 Surround
+            bitrate = "384k"
+        else:            # Other layouts
+            bitrate = "96k"
+
+    logging.info(f"    - Encoding Audio Track #{index} to Opus at {bitrate}...")
+    run_cmd([
+        "opusenc", "--vbr", "--bitrate", bitrate, str(temp_normalized), str(final_opus)
+    ])
+    return final_opus
+
+def convert_video(source_file_base: str, source_file_full: str, is_vfr: bool, target_cfr_fps_for_handbrake: Optional[str], autocrop_filter: Optional[str] = None) -> tuple[Path, Optional[Path]]:
+    logging.info("  --- Starting Video Processing ---")
+    # source_file_base is file_path.stem (e.g., "my.anime.episode.01")
+    vpy_file = Path(f"{source_file_base}.vpy")
+    ut_video_file = Path(f"{source_file_base}.ut.mkv")
+    encoded_video_file = Path(f"temp-{source_file_base}.mkv")
+    handbrake_cfr_intermediate_file = None # To store path of HandBrake output if created
+
+    current_input_for_utvideo = Path(source_file_full)
+
+    if is_vfr and target_cfr_fps_for_handbrake:
+        logging.info(f"    - Source is VFR. Converting to CFR ({target_cfr_fps_for_handbrake}) with HandBrakeCLI...")
+        handbrake_cfr_intermediate_file = Path(f"{source_file_base}.cfr_temp.mkv")
+        handbrake_args = [
+            "HandBrakeCLI", 
+            "--input", str(source_file_full), 
+            "--output", str(handbrake_cfr_intermediate_file),
+            "--cfr", 
+            "--rate", str(target_cfr_fps_for_handbrake),
+            "--encoder", "x264_10bit", # Changed to x264_10bit for 10-bit CFR intermediate
+            "--quality", "0", # CRF 0 for x264 is often considered visually lossless, or near-lossless
+            "--encoder-preset", "superfast", # Use a fast preset for quicker processing
+            "--encoder-tune", "fastdecode", # Added tune for faster decoding
+            "--audio", "none", 
+            "--subtitle", "none",
+            "--crop-mode", "none" # Disable auto-cropping
+        ]
+        logging.info(f"    - Running HandBrakeCLI: {' '.join(handbrake_args)}")
+        try:
+            run_cmd(handbrake_args)
+            if handbrake_cfr_intermediate_file.exists() and handbrake_cfr_intermediate_file.stat().st_size > 0:
+                logging.info(f"    - HandBrake VFR to CFR conversion successful: {handbrake_cfr_intermediate_file}")
+                current_input_for_utvideo = handbrake_cfr_intermediate_file
+            else:
+                logging.info(f"    - Warning: HandBrakeCLI VFR-to-CFR conversion failed or produced an empty file. Proceeding with original source for UTVideo.")
+                handbrake_cfr_intermediate_file = None # Ensure it's None if failed
+        except subprocess.CalledProcessError as e:
+            logging.info(f"    - Error during HandBrakeCLI execution: {e}")
+            logging.info(f"    - Proceeding with original source for UTVideo.")
+            handbrake_cfr_intermediate_file = None # Ensure it's None if failed
+
+
+    logging.info("    - Creating UTVideo intermediate file (overwriting if exists)...")
+    # Check if source is already UTVideo
+    ffprobe_cmd = [
+        "ffprobe", "-v", "error", "-select_streams", "v:0",
+        "-show_entries", "stream=codec_name", "-of", "default=noprint_wrappers=1:nokey=1",
+        str(current_input_for_utvideo) # Use current input, which might be HandBrake output
+    ]
+    source_codec = run_cmd(ffprobe_cmd, capture_output=True, check=True)
+    if source_codec:
+        source_codec = source_codec.strip()
+    else:
+        source_codec = ""
+
+    video_codec_args = ["-c:v", "utvideo"]
+    if source_codec == "utvideo" and current_input_for_utvideo == Path(source_file_full): # Only copy if original was UTVideo
+        logging.info("    - Source is already UTVideo. Copying video stream...")
+        video_codec_args = ["-c:v", "copy"]
+
+    ffmpeg_args = [
+        "ffmpeg", "-hide_banner", "-v", "quiet", "-stats", "-y", "-i", str(current_input_for_utvideo),
+        "-map", "0:v:0", "-map_metadata", "-1", "-map_chapters", "-1", "-an", "-sn", "-dn",
+    ]
+    if autocrop_filter:
+        ffmpeg_args += ["-vf", autocrop_filter]
+    ffmpeg_args += video_codec_args + [str(ut_video_file)]
+    run_cmd(ffmpeg_args)
+
+    logging.info("    - Indexing UTVideo file with ffmsindex for VapourSynth...")
+    ffmsindex_args = ["ffmsindex", "-f", str(ut_video_file)]
+    run_cmd(ffmsindex_args)
+
+    ut_video_full_path = os.path.abspath(ut_video_file)
+    vpy_script_content = f"""import vapoursynth as vs
+core = vs.core
+core.num_threads = 4
+clip = core.ffms2.Source(source=r'''{ut_video_full_path}''')
+clip = core.resize.Point(clip, format=vs.YUV420P10, matrix_in_s="709") # type: ignore
+clip.set_output()
+"""
+    with vpy_file.open("w", encoding="utf-8") as f:
+        f.write(vpy_script_content)
+
+    logging.info("    - Starting AV1 encode with av1an (this will take a long time)...")
+    total_cores = os.cpu_count() or 4 # Fallback if cpu_count is None
+    workers = max(1, (total_cores // 2) - 1) # Half the cores minus one, with a minimum of 1 worker.
+    logging.info(f"    - Using {workers} workers for av1an (Total Cores: {total_cores}, Logic: (Cores/2)-1).")
+
+    # Create the parameter string for av1an's -v option, which expects a single string.
+    av1an_video_params_str = " ".join([f"--{key} {value}" for key, value in SVT_AV1_PARAMS.items()])
+    logging.info(f"    - Using SVT-AV1 parameters: {av1an_video_params_str}")
+
+    av1an_enc_args = [
+        "av1an", "-i", str(vpy_file), "-o", str(encoded_video_file), "-n",
+        "-e", "svt-av1", "--resume", "--sc-pix-format", "yuv420p", "-c", "mkvmerge",
+        "--set-thread-affinity", "2", "--pix-format", "yuv420p10le", "--force", "--no-defaults",
+        "-w", str(workers),
+        "-v", av1an_video_params_str
+    ]
+    run_cmd(av1an_enc_args)
+    logging.info("  --- Finished Video Processing ---")
+    return encoded_video_file, handbrake_cfr_intermediate_file
+
+def is_ffmpeg_decodable(file_path):
+    """Quickly check if ffmpeg can decode the input file."""
+    try:
+        # Try to decode a short segment of the first audio stream
+        subprocess.run([
+            "ffmpeg", "-v", "error", "-i", str(file_path), "-map", "0:a:0", "-t", "1", "-f", "null", "-"
+        ], check=True)
+        return True
+    except subprocess.CalledProcessError:
+        return False
+
+# --- CROPDETECT LOGIC FROM cropdetect.py ---
+import argparse as _argparse_cropdetect
+import multiprocessing as _multiprocessing_cropdetect
+from collections import Counter as _Counter_cropdetect
+
+COLOR_GREEN = "\033[92m"
+COLOR_RED = "\033[91m"
+COLOR_YELLOW = "\033[93m"
+COLOR_RESET = "\033[0m"
+
+KNOWN_ASPECT_RATIOS = [
+    {"name": "HDTV (16:9)", "ratio": 16/9},
+    {"name": "Widescreen (Scope)", "ratio": 2.39},
+    {"name": "Widescreen (Flat)", "ratio": 1.85},
+    {"name": "IMAX Digital (1.90:1)", "ratio": 1.90},
+    {"name": "Fullscreen (4:3)", "ratio": 4/3},
+    {"name": "IMAX 70mm (1.43:1)", "ratio": 1.43},
+]
+
+def _check_prerequisites_cropdetect():
+    for tool in ['ffmpeg', 'ffprobe']:
+        if not shutil.which(tool):
+            print(f"Error: '{tool}' command not found. Is it installed and in your PATH?")
+            return False
+    return True
+
+def _analyze_segment_cropdetect(task_args):
+    seek_time, input_file, width, height = task_args
+    ffmpeg_args = [
+        'ffmpeg', '-hide_banner',
+        '-ss', str(seek_time),
+        '-i', input_file, '-t', '1', '-vf', 'cropdetect',
+        '-f', 'null', '-'
+    ]
+    result = subprocess.run(ffmpeg_args, capture_output=True, text=True, encoding='utf-8')
+    if result.returncode != 0:
+        return []
+    crop_detections = re.findall(r'crop=(\d+):(\d+):(\d+):(\d+)', result.stderr)
+    significant_crops = []
+    for w_str, h_str, x_str, y_str in crop_detections:
+        w, h, x, y = map(int, [w_str, h_str, x_str, y_str])
+        significant_crops.append((f"crop={w}:{h}:{x}:{y}", seek_time))
+    return significant_crops
+
+def _snap_to_known_ar_cropdetect(w, h, x, y, video_w, video_h, tolerance=0.03):
+    if h == 0: return f"crop={w}:{h}:{x}:{y}", None
+    detected_ratio = w / h
+    best_match = None
+    smallest_diff = float('inf')
+    for ar in KNOWN_ASPECT_RATIOS:
+        diff = abs(detected_ratio - ar['ratio'])
+        if diff < smallest_diff:
+            smallest_diff = diff
+            best_match = ar
+    if not best_match or (smallest_diff / best_match['ratio']) >= tolerance:
+        return f"crop={w}:{h}:{x}:{y}", None
+    if abs(w - video_w) < 16:
+        new_h = round(video_w / best_match['ratio'])
+        if new_h % 8 != 0:
+            new_h = new_h + (8 - (new_h % 8))
+        new_h = min(new_h, video_h)
+        new_y = round((video_h - new_h) / 2)
+        if new_y % 2 != 0:
+            new_y -= 1
+        new_y = max(0, new_y)
+        return f"crop={video_w}:{new_h}:0:{new_y}", best_match['name']
+    if abs(h - video_h) < 16:
+        new_w = round(video_h * best_match['ratio'])
+        if new_w % 8 != 0:
+            new_w = new_w + (8 - (new_w % 8))
+        new_w = min(new_w, video_w)
+        new_x = round((video_w - new_w) / 2)
+        if new_x % 2 != 0:
+            new_x -= 1
+        new_x = max(0, new_x)
+        return f"crop={new_w}:{video_h}:{new_x}:0", best_match['name']
+    return f"crop={w}:{h}:{x}:{y}", None
+
+def _cluster_crop_values_cropdetect(crop_counts, tolerance=8):
+    clusters = []
+    temp_counts = crop_counts.copy()
+    while temp_counts:
+        center_str, _ = temp_counts.most_common(1)[0]
+        try:
+            _, values = center_str.split('=');
+            cw, ch, cx, cy = map(int, values.split(':'))
+        except (ValueError, IndexError):
+            del temp_counts[center_str]
+            continue
+        cluster_total_count = 0
+        crops_to_remove = []
+        for crop_str, count in temp_counts.items():
+            try:
+                _, values = crop_str.split('=');
+                w, h, x, y = map(int, values.split(':'))
+                if abs(x - cx) <= tolerance and abs(y - cy) <= tolerance:
+                    cluster_total_count += count
+                    crops_to_remove.append(crop_str)
+            except (ValueError, IndexError):
+                continue
+        if cluster_total_count > 0:
+            clusters.append({'center': center_str, 'count': cluster_total_count})
+        for crop_str in crops_to_remove:
+            del temp_counts[crop_str]
+    clusters.sort(key=lambda c: c['count'], reverse=True)
+    return clusters
+
+def _parse_crop_string_cropdetect(crop_str):
+    try:
+        _, values = crop_str.split('=');
+        w, h, x, y = map(int, values.split(':'))
+        return {'w': w, 'h': h, 'x': x, 'y': y}
+    except (ValueError, IndexError):
+        return None
+
+def _calculate_bounding_box_cropdetect(crop_keys):
+    min_x = min_w = min_y = min_h = float('inf')
+    max_x = max_w = max_y = max_h = float('-inf')
+    for key in crop_keys:
+        parsed = _parse_crop_string_cropdetect(key)
+        if not parsed:
+            continue
+        w, h, x, y = parsed['w'], parsed['h'], parsed['x'], parsed['y']
+        min_x = min(min_x, x)
+        min_y = min(min_y, y)
+        max_x = max(max_x, x + w)
+        max_y = max(max_y, y + h)
+        min_w = min(min_w, w)
+        min_h = min(min_h, h)
+        max_w = max(max_w, w)
+        max_h = max(max_h, h)
+    if (max_x - min_x) <= 2 and (max_y - min_y) <= 2:
+        return None
+    bounding_crop = f"crop={max_x - min_x}:{max_y - min_y}:{min_x}:{min_y}"
+    return bounding_crop
+
+def _analyze_video_cropdetect(input_file, duration, width, height, num_workers, significant_crop_threshold, min_crop, debug=False):
+    num_tasks = num_workers * 4
+    segment_duration = max(1, duration // num_tasks)
+    tasks = [(i * segment_duration, input_file, width, height) for i in range(num_tasks)]
+    crop_results = []
+    with _multiprocessing_cropdetect.Pool(processes=num_workers) as pool:
+        results_iterator = pool.imap_unordered(_analyze_segment_cropdetect, tasks)
+        for result in results_iterator:
+            crop_results.append(result)
+    all_crops_with_ts = [crop for sublist in crop_results for crop in sublist]
+    all_crop_strings = [item[0] for item in all_crops_with_ts]
+    if not all_crop_strings:
+        return None
+    crop_counts = _Counter_cropdetect(all_crop_strings)
+    clusters = _cluster_crop_values_cropdetect(crop_counts)
+    total_detections = sum(c['count'] for c in clusters)
+    significant_clusters = []
+    for cluster in clusters:
+        percentage = (cluster['count'] / total_detections) * 100
+        if percentage >= significant_crop_threshold:
+            significant_clusters.append(cluster)
+    for cluster in significant_clusters:
+        parsed_crop = _parse_crop_string_cropdetect(cluster['center'])
+        if parsed_crop:
+            _, ar_label = _snap_to_known_ar_cropdetect(
+                parsed_crop['w'], parsed_crop['h'], parsed_crop['x'], parsed_crop['y'], width, height
+            )
+            cluster['ar_label'] = ar_label
+        else:
+            cluster['ar_label'] = None
+    if not significant_clusters:
+        return None
+    elif len(significant_clusters) == 1:
+        dominant_cluster = significant_clusters[0]
+        parsed_crop = _parse_crop_string_cropdetect(dominant_cluster['center'])
+        snapped_crop, ar_label = _snap_to_known_ar_cropdetect(
+            parsed_crop['w'], parsed_crop['h'], parsed_crop['x'], parsed_crop['y'], width, height
+        )
+        parsed_snapped = _parse_crop_string_cropdetect(snapped_crop)
+        if parsed_snapped and parsed_snapped['w'] == width and parsed_snapped['h'] == height:
+            return None
+        else:
+            return snapped_crop
+    else:
+        crop_keys = [c['center'] for c in significant_clusters]
+        bounding_box_crop = _calculate_bounding_box_cropdetect(crop_keys)
+        if bounding_box_crop:
+            parsed_bb = _parse_crop_string_cropdetect(bounding_box_crop)
+            snapped_crop, ar_label = _snap_to_known_ar_cropdetect(
+                parsed_bb['w'], parsed_bb['h'], parsed_bb['x'], parsed_bb['y'], width, height
+            )
+            parsed_snapped = _parse_crop_string_cropdetect(snapped_crop)
+            if parsed_snapped and parsed_snapped['w'] == width and parsed_snapped['h'] == height:
+                return None
+            else:
+                return snapped_crop
+        else:
+            return None
+
+def detect_autocrop_filter(input_file, significant_crop_threshold=5.0, min_crop=10, debug=False):
+    if not _check_prerequisites_cropdetect():
+        return None
+    try:
+        probe_duration_args = [
+            'ffprobe', '-v', 'error', '-show_entries', 'format=duration', '-of', 'default=noprint_wrappers=1:nokey=1',
+            input_file
+        ]
+        duration_str = subprocess.check_output(probe_duration_args, stderr=subprocess.STDOUT, text=True)
+        duration = int(float(duration_str))
+        probe_res_args = [
+            'ffprobe', '-v', 'error',
+            '-select_streams', 'v',
+            '-show_entries', 'stream=width,height,disposition',
+            '-of', 'json',
+            input_file
+        ]
+        probe_output = subprocess.check_output(probe_res_args, stderr=subprocess.STDOUT, text=True)
+        streams_data = json.loads(probe_output)
+        video_stream = None
+        for stream in streams_data.get('streams', []):
+            if stream.get('disposition', {}).get('attached_pic', 0) == 0:
+                video_stream = stream
+                break
+        if not video_stream or 'width' not in video_stream or 'height' not in video_stream:
+            return None
+        width = int(video_stream['width'])
+        height = int(video_stream['height'])
+    except Exception:
+        return None
+    return _analyze_video_cropdetect(input_file, duration, width, height, max(1, os.cpu_count() // 2), significant_crop_threshold, min_crop, debug)
+
+def parse_arguments() -> argparse.Namespace:
+    parser = argparse.ArgumentParser(description="Batch-process MKV files with resumable video encoding, audio downmixing, per-file logging, and optional autocrop.")
+    parser.add_argument("--no-downmix", action="store_true", help="Preserve original audio channel layout.")
+    parser.add_argument("--autocrop", action="store_true", help="Automatically detect and crop black bars from video using cropdetect.")
+    parser.add_argument("--speed", type=str, help="Set the encoding speed. Possible values: slower, slow, medium, fast, faster.")
+    parser.add_argument("--quality", type=str, help="Set the encoding quality. Possible values: lowest, low, medium, high, higher.")
+    parser.add_argument("--grain", type=int, help="Set the film-grain value (number). Adjusts the film grain synthesis level.")
+    return parser.parse_args()
+
+def process_file(file_path: Path, no_downmix: bool, autocrop: bool) -> None:
+    current_dir = Path(".")
+    log_file_name = f"{file_path.stem}.log"
+    log_file_path = DIR_CONV_LOGS / log_file_name
+    
+    # Setup logging for this file
+    setup_logging(log_file_path)
+    
+    logging.info(f"STARTING LOG FOR: {file_path.name}")
+    logging.info(f"Processing started at: {datetime.now()}")
+    logging.info(f"Full input file path: {file_path.resolve()}")
+    logging.info("-" * shutil.get_terminal_size(fallback=(80, 24)).columns)
+    
+    input_file_abs = file_path.resolve()
+    intermediate_output_file = current_dir / f"output-{file_path.name}"
+    audio_temp_dir = None
+    handbrake_intermediate_for_cleanup = None
+    processing_error_occurred = False
+    
+    start_time = datetime.now()
+    
+    try:
+        audio_temp_dir = tempfile.mkdtemp(prefix="anime_audio_")
+        logging.info(f"Audio temporary directory created at: {audio_temp_dir}")
+        logging.info(f"Analyzing file: {input_file_abs}")
+        
+        ffprobe_info_json = run_cmd([
+            "ffprobe", "-v", "quiet", "-print_format", "json", "-show_streams", "-show_format", str(input_file_abs)
+        ], capture_output=True)
+        if not ffprobe_info_json:
+             raise RuntimeError("ffprobe failed to return info")
+        ffprobe_info = json.loads(ffprobe_info_json)
+        
+        mkvmerge_info_json = run_cmd([
+            "mkvmerge", "-J", str(input_file_abs)
+        ], capture_output=True)
+        if not mkvmerge_info_json:
+             raise RuntimeError("mkvmerge failed to return info")
+        mkv_info = json.loads(mkvmerge_info_json)
+        
+        mediainfo_json = run_cmd([
+            "mediainfo", "--Output=JSON", "-f", str(input_file_abs)
+        ], capture_output=True)
+        if not mediainfo_json:
+             raise RuntimeError("mediainfo failed to return info")
+        media_info = json.loads(mediainfo_json)
+        
+        is_vfr = False
+        target_cfr_fps_for_handbrake = None
+        video_track_info = None
+        if media_info.get("media") and media_info["media"].get("track"):
+            for track in media_info["media"]["track"]:
+                if track.get("@type") == "Video":
+                    video_track_info = track
+                    break
+        
+        if video_track_info:
+            frame_rate_mode = video_track_info.get("FrameRate_Mode")
+            if frame_rate_mode and frame_rate_mode.upper() in ["VFR", "VARIABLE"]:
+                is_vfr = True
+                logging.info(f"    - Detected VFR based on MediaInfo FrameRate_Mode: {frame_rate_mode}")
+                original_fps_str = video_track_info.get("FrameRate_Original_String")
+                if original_fps_str:
+                    match = re.search(r'\((\d+/\d+)\)', original_fps_str)
+                    if match:
+                        target_cfr_fps_for_handbrake = match.group(1)
+                    else:
+                        target_cfr_fps_for_handbrake = video_track_info.get("FrameRate_Original")
+                if not target_cfr_fps_for_handbrake:
+                    target_cfr_fps_for_handbrake = video_track_info.get("FrameRate_Original")
+                if not target_cfr_fps_for_handbrake:
+                    target_cfr_fps_for_handbrake = video_track_info.get("FrameRate")
+                    if target_cfr_fps_for_handbrake:
+                        logging.info(f"    - Using MediaInfo FrameRate ({target_cfr_fps_for_handbrake}) as fallback for HandBrake target FPS.")
+                
+                if target_cfr_fps_for_handbrake:
+                    logging.info(f"    - Target CFR for HandBrake: {target_cfr_fps_for_handbrake}")
+                    if isinstance(target_cfr_fps_for_handbrake, str) and "/" in target_cfr_fps_for_handbrake:
+                        try:
+                            num, den = map(float, target_cfr_fps_for_handbrake.split('/'))
+                            target_cfr_fps_for_handbrake = f"{num / den:.3f}"
+                            logging.info(f"    - Converted fractional FPS to decimal for HandBrake: {target_cfr_fps_for_handbrake}")
+                        except ValueError:
+                            logging.info(f"    - Warning: Could not parse fractional FPS '{target_cfr_fps_for_handbrake}'. HandBrakeCLI might fail.")
+                            is_vfr = False
+                else:
+                    logging.info("    - Warning: VFR detected, but could not determine target CFR from MediaInfo. Will attempt standard UTVideo conversion without HandBrake.")
+                    is_vfr = False
+            else:
+                logging.info(f"    - Video appears to be CFR or FrameRate_Mode not specified as VFR/Variable by MediaInfo.")
+        
+        autocrop_filter = None
+        if autocrop:
+            logging.info("--- Running autocrop detection ---")
+            autocrop_filter = detect_autocrop_filter(str(input_file_abs))
+            if autocrop_filter:
+                logging.info(f"    - Autocrop filter detected: {autocrop_filter}")
+            else:
+                logging.info("    - No crop needed or detected.")
+        
+        encoded_video_file, handbrake_intermediate_for_cleanup = convert_video(
+            file_path.stem, str(input_file_abs), is_vfr, target_cfr_fps_for_handbrake, autocrop_filter=autocrop_filter
+        )
+
+        logging.info("--- Starting Audio Processing ---")
+        processed_audio_files = []
+        audio_tracks_to_remux = []
+        audio_streams = [s for s in ffprobe_info.get("streams", []) if s.get("codec_type") == "audio"]
+
+        # Build mkvmerge track mapping by track ID
+        mkv_audio_tracks = {t["id"]: t for t in mkv_info.get("tracks", []) if t.get("type") == "audio"}
+
+        # Build mediainfo track mapping by StreamOrder
+        media_tracks_data = media_info.get("media", {}).get("track", [])
+        mediainfo_audio_tracks = {int(t.get("StreamOrder", -1)): t for t in media_tracks_data if t.get("@type") == "Audio"}
+
+        for stream in audio_streams:
+            stream_index = stream["index"]
+            codec = stream.get("codec_name")
+            channels = stream.get("channels", 2)
+            language = stream.get("tags", {}).get("language", "und")
+
+            # Find mkvmerge track by matching ffprobe stream index to mkvmerge track's 'properties'->'stream_id'
+            mkv_track = None
+            for t in mkv_info.get("tracks", []):
+                if t.get("type") == "audio" and t.get("properties", {}).get("stream_id") == stream_index:
+                    mkv_track = t
+                    break
+            if not mkv_track:
+                # Fallback: try by position
+                mkv_track = mkv_info.get("tracks", [])[stream_index] if stream_index < len(mkv_info.get("tracks", [])) else {}
+
+            track_id = mkv_track.get("id", -1)
+            track_title = mkv_track.get("properties", {}).get("track_name", "")
+
+            # Find mediainfo track by StreamOrder
+            audio_track_info = mediainfo_audio_tracks.get(stream_index)
+            track_delay = 0
+            delay_raw = audio_track_info.get("Video_Delay") if audio_track_info else None
+            if delay_raw is not None:
+                try:
+                    delay_val = float(delay_raw)
+                    # If the value is a float < 1, it's seconds, so convert to ms.
+                    if delay_val < 1:
+                        track_delay = int(round(delay_val * 1000))
+                    else:
+                        track_delay = int(round(delay_val))
+                except Exception:
+                    track_delay = 0
+
+            logging.info(f"Processing Audio Stream #{stream_index} (TID: {track_id}, Codec: {codec}, Channels: {channels})")
+            if codec in REMUX_CODECS:
+                audio_tracks_to_remux.append(str(track_id))
+            else:
+                # Convert any codec that is not in REMUX_CODECS
+                opus_file = convert_audio_track(
+                    stream_index, channels, language, audio_temp_dir, str(input_file_abs), not no_downmix
+                )
+                processed_audio_files.append({
+                    "Path": opus_file,
+                    "Language": language,
+                    "Title": track_title,
+                    "Delay": track_delay
+                })
+
+        logging.info("--- Finished Audio Processing ---")
+
+        # Final mux
+        logging.info("Assembling final file with mkvmerge...")
+        mkvmerge_args = ["mkvmerge", "-o", str(intermediate_output_file), str(encoded_video_file)]
+        for file_info in processed_audio_files:
+            sync_switch = ["--sync", f"0:{file_info['Delay']}"] if file_info["Delay"] else []
+            mkvmerge_args += [
+                "--language", f"0:{file_info['Language']}",
+                "--track-name", f"0:{file_info['Title']}"
+            ] + sync_switch + [str(file_info["Path"])]
+
+        source_copy_args = ["--no-video"]
+        if audio_tracks_to_remux:
+            source_copy_args += ["--audio-tracks", ",".join(audio_tracks_to_remux)]
+        else:
+            source_copy_args += ["--no-audio"]
+        mkvmerge_args += source_copy_args + [str(input_file_abs)]
+        run_cmd(mkvmerge_args)
+
+        # Move files
+        logging.info("Moving files to final destinations...")
+        shutil.move(str(file_path), DIR_ORIGINAL / file_path.name)
+        shutil.move(str(intermediate_output_file), DIR_COMPLETED / file_path.name)
+
+        logging.info("Cleaning up persistent video temporary files (after successful processing)...")
+        video_temp_files_on_success = [
+            current_dir / f"{file_path.stem}.vpy",
+            current_dir / f"{file_path.stem}.ut.mkv",
+            current_dir / f"temp-{file_path.stem}.mkv", # This is encoded_video_file
+            current_dir / f"{file_path.stem}.ut.mkv.lwi", 
+            current_dir / f"{file_path.stem}.ut.mkv.ffindex",
+        ]
+        if handbrake_intermediate_for_cleanup and handbrake_intermediate_for_cleanup.exists():
+            video_temp_files_on_success.append(handbrake_intermediate_for_cleanup)
+        
+        for temp_vid_file in video_temp_files_on_success:
+            if temp_vid_file.exists():
+                logging.info(f"    Deleting: {temp_vid_file}")
+                temp_vid_file.unlink(missing_ok=True)
+            else:
+                logging.info(f"    Skipping (not found): {temp_vid_file}")
+
+    except Exception as e:
+        logging.error(f"ERROR: An error occurred while processing '{file_path.name}': {e}")
+        processing_error_occurred = True
+    finally:
+        logging.info("--- Starting Universal Cleanup (for this file) ---")
+        logging.info("  - Cleaning up disposable audio temporary directory...")
+        if audio_temp_dir and Path(audio_temp_dir).exists():
+            shutil.rmtree(audio_temp_dir, ignore_errors=True)
+            logging.info(f"    - Deleted audio temp dir: {audio_temp_dir}")
+        elif audio_temp_dir:
+            logging.info(f"    - Audio temp dir not found or already cleaned: {audio_temp_dir}")
+        else:
+            logging.info(f"    - Audio temp dir was not created.")
+        
+        logging.info("  - Cleaning up intermediate output file (if it wasn't moved on success)...")
+        if intermediate_output_file.exists():
+            if processing_error_occurred:
+                logging.warning(f"    - WARNING: Processing error occurred. Intermediate output file '{intermediate_output_file}' is being preserved at its original path for inspection.")
+            else:
+                logging.info(f"    - INFO: Intermediate output file '{intermediate_output_file}' found at original path despite no errors (expected to be moved). Cleaning up.")
+                intermediate_output_file.unlink(missing_ok=True)
+                logging.info(f"    - Deleted intermediate output file from original path: {intermediate_output_file}")
+        else:
+            if not processing_error_occurred:
+                logging.info(f"    - Intermediate output file successfully moved (not found at original path, as expected): {intermediate_output_file}")
+            else:
+                logging.info(f"    - Processing error occurred, and intermediate output file '{intermediate_output_file}' not found at original path (likely not created or cleaned by another step).")
+        
+        runtime = datetime.now() - start_time
+        runtime_str = str(runtime).split('.')[0]
+        logging.info(f"\nTotal runtime for this file: {runtime_str}")
+        logging.info(f"FINISHED LOG FOR: {file_path.name}")
+
+def main() -> None:
+    args = parse_arguments()
+    check_tools()
+
+    # Override default SVT-AV1 params if provided via command line
+    if args.speed:
+        SVT_AV1_PARAMS["speed"] = args.speed
+    if args.quality:
+        SVT_AV1_PARAMS["quality"] = args.quality
+    if args.grain is not None:
+        SVT_AV1_PARAMS["film-grain"] = args.grain
+
+    current_dir = Path(".")
+    DIR_COMPLETED.mkdir(exist_ok=True, parents=True)
+    DIR_ORIGINAL.mkdir(exist_ok=True, parents=True)
+    DIR_CONV_LOGS.mkdir(exist_ok=True, parents=True)
+
+    files_to_process = sorted(
+        f for f in current_dir.glob("*.mkv")
+        if not (f.name.endswith(".ut.mkv") or f.name.startswith("temp-") or f.name.startswith("output-") or f.name.endswith(".cfr_temp.mkv"))
+    )
+    if not files_to_process:
+        print("No MKV files found to process. Exiting.")
+        return
+
+    while True:
+        files_to_process = sorted(
+            f for f in current_dir.glob("*.mkv")
+            if not (f.name.endswith(".ut.mkv") or f.name.startswith("temp-") or f.name.startswith("output-") or f.name.endswith(".cfr_temp.mkv"))
+        )
+        if not files_to_process:
+            print("No more .mkv files found to process in the current directory. The script will now exit.")
+            break
+        
+        file_path = files_to_process[0]
+        if not is_ffmpeg_decodable(file_path):
+            print(f"ERROR: ffmpeg cannot decode '{file_path.name}'. Skipping this file.", file=sys.stderr)
+            shutil.move(str(file_path), DIR_ORIGINAL / file_path.name)
+            continue
+            
+        process_file(file_path, args.no_downmix, args.autocrop)
+
+if __name__ == "__main__":
+    main()

av1_opus_encoder.py.bak

@@ -0,0 +1,773 @@
+#!/usr/bin/env python3
+import os
+import sys
+import subprocess
+import shutil
+import tempfile
+import json
+import re # Added for VFR frame rate parsing
+from datetime import datetime
+from pathlib import Path
+
+REQUIRED_TOOLS = [
+    "ffmpeg", "ffprobe", "mkvmerge", "mkvpropedit",
+    "opusenc", "mediainfo", "av1an", "HandBrakeCLI", "ffmsindex" # Added HandBrakeCLI and ffmsindex
+]
+DIR_COMPLETED = Path("completed")
+DIR_ORIGINAL = Path("original")
+DIR_CONV_LOGS = Path("conv_logs") # Directory for conversion logs
+
+REMUX_CODECS = {"aac", "opus"}  # Using a set for efficient lookups
+
+SVT_AV1_PARAMS = {
+    "speed": "slower",  # "slower", "slow", "medium", "fast", "faster"
+    "quality": "medium",  # "higher", "high", "medium", "low", "lower"
+    "film-grain": 6,
+    "color-primaries": 1,
+    "transfer-characteristics": 1,
+    "matrix-coefficients": 1,
+    "scd": 0,  # Scene change detection OFF for Av1an use
+    "keyint": 0,  # Keyframe interval, 0 disables automatic keyframes placement at a constant interval
+    "lp": 2, # Level of parallelism
+    "auto-tiling": 1,  # Auto tiling ON
+    "tune": 1,  # 0 = VQ, 1 = PSNR, 2 = SSIM
+    "progress": 2,  # Detailed progress output
+}
+
+def check_tools():
+    for tool in REQUIRED_TOOLS:
+        if shutil.which(tool) is None:
+            print(f"Required tool '{tool}' not found in PATH.")
+            sys.exit(1)
+
+def run_cmd(cmd, capture_output=False, check=True):
+    if capture_output:
+        result = subprocess.run(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, check=check, text=True)
+        return result.stdout
+    else:
+        subprocess.run(cmd, check=check)
+
+def convert_audio_track(index, ch, lang, audio_temp_dir, source_file, should_downmix):
+    audio_temp_path = Path(audio_temp_dir)
+    temp_extracted = audio_temp_path / f"track_{index}_extracted.flac"
+    temp_normalized = audio_temp_path / f"track_{index}_normalized.flac"
+    final_opus = audio_temp_path / f"track_{index}_final.opus"
+
+    print(f"    - Extracting Audio Track #{index} to FLAC...")
+    ffmpeg_args = [
+        "ffmpeg", "-v", "quiet", "-stats", "-y", "-i", str(source_file), "-map", f"0:{index}", "-map_metadata", "-1"
+    ]
+    if should_downmix and ch >= 6:
+        if ch == 6:
+            ffmpeg_args += ["-af", "pan=stereo|c0=c2+0.30*c0+0.30*c4|c1=c2+0.30*c1+0.30*c5"]
+        elif ch == 8:
+            ffmpeg_args += ["-af", "pan=stereo|c0=c2+0.30*c0+0.30*c4+0.30*c6|c1=c2+0.30*c1+0.30*c5+0.30*c7"]
+        else: # Other multi-channel (e.g. 7ch, 10ch)
+            ffmpeg_args += ["-ac", "2"]
+    ffmpeg_args += ["-c:a", "flac", str(temp_extracted)]
+    run_cmd(ffmpeg_args)
+
+    print(f"    - Normalizing Audio Track #{index} with ffmpeg (loudnorm 2-pass)...")
+    # First pass: Analyze the audio to get loudnorm stats
+    # The stats are printed to stderr, so we must use subprocess.run directly to capture it.
+    print("      - Pass 1: Analyzing...")
+    result = subprocess.run(
+        ["ffmpeg", "-v", "info", "-i", str(temp_extracted), "-af", "loudnorm=I=-23:LRA=7:tp=-1:print_format=json", "-f", "null", "-"],
+        capture_output=True, text=True, check=True)
+    
+    # Find the start of the JSON block in stderr and parse it.
+    # This is more robust than slicing the last N lines.
+    # We find the start and end of the JSON block to avoid parsing extra data.
+    stderr_output = result.stderr
+    json_start_index = stderr_output.find('{')
+    if json_start_index == -1:
+        raise ValueError("Could not find start of JSON block in ffmpeg output for loudnorm analysis.")
+
+    brace_level = 0
+    json_end_index = -1
+    for i, char in enumerate(stderr_output[json_start_index:]):
+        if char == '{':
+            brace_level += 1
+        elif char == '}':
+            brace_level -= 1
+            if brace_level == 0:
+                json_end_index = json_start_index + i + 1
+                break
+    
+    stats = json.loads(stderr_output[json_start_index:json_end_index])
+
+    # Second pass: Apply the normalization using the stats from the first pass
+    print("      - Pass 2: Applying normalization...")
+    run_cmd([
+        "ffmpeg", "-v", "quiet", "-stats", "-y", "-i", str(temp_extracted), "-af",
+        f"loudnorm=I=-23:LRA=7:tp=-1:measured_i={stats['input_i']}:measured_lra={stats['input_lra']}:measured_tp={stats['input_tp']}:measured_thresh={stats['input_thresh']}:offset={stats['target_offset']}",
+        "-c:a", "flac", str(temp_normalized)
+    ])
+
+    # Set bitrate based on the final channel count of the Opus file.
+    # If we are downmixing, the result is stereo.
+    # If not, the result has the original channel count.
+    is_being_downmixed = should_downmix and ch >= 6
+
+    if is_being_downmixed:
+        # Downmixing from 5.1 or 7.1 results in a stereo track.
+        bitrate = "128k"
+    else:
+        # Not downmixing (or source is already stereo or less).
+        # Base bitrate on the source channel count.
+        if ch == 1:      # Mono
+            bitrate = "64k"
+        elif ch == 2:    # Stereo
+            bitrate = "128k"
+        elif ch == 6:    # 5.1 Surround
+            bitrate = "256k"
+        elif ch == 8:    # 7.1 Surround
+            bitrate = "384k"
+        else:            # Other layouts
+            bitrate = "96k" # A sensible default for other/uncommon layouts.
+
+    print(f"    - Encoding Audio Track #{index} to Opus at {bitrate}...")
+    run_cmd([
+        "opusenc", "--vbr", "--bitrate", bitrate, str(temp_normalized), str(final_opus)
+    ])
+    return final_opus
+
+def convert_video(source_file_base, source_file_full, is_vfr, target_cfr_fps_for_handbrake, autocrop_filter=None):
+    print("  --- Starting Video Processing ---")
+    # source_file_base is file_path.stem (e.g., "my.anime.episode.01")
+    vpy_file = Path(f"{source_file_base}.vpy")
+    ut_video_file = Path(f"{source_file_base}.ut.mkv")
+    encoded_video_file = Path(f"temp-{source_file_base}.mkv")
+    handbrake_cfr_intermediate_file = None # To store path of HandBrake output if created
+
+    current_input_for_utvideo = Path(source_file_full)
+
+    if is_vfr and target_cfr_fps_for_handbrake:
+        print(f"    - Source is VFR. Converting to CFR ({target_cfr_fps_for_handbrake}) with HandBrakeCLI...")
+        handbrake_cfr_intermediate_file = Path(f"{source_file_base}.cfr_temp.mkv")
+        handbrake_args = [
+            "HandBrakeCLI", 
+            "--input", str(source_file_full), 
+            "--output", str(handbrake_cfr_intermediate_file),
+            "--cfr", 
+            "--rate", str(target_cfr_fps_for_handbrake),
+            "--encoder", "x264_10bit", # Changed to x264_10bit for 10-bit CFR intermediate
+            "--quality", "0", # CRF 0 for x264 is often considered visually lossless, or near-lossless
+            "--encoder-preset", "superfast", # Use a fast preset for quicker processing
+            "--encoder-tune", "fastdecode", # Added tune for faster decoding
+            "--audio", "none", 
+            "--subtitle", "none",
+            "--crop-mode", "none" # Disable auto-cropping
+        ]
+        print(f"    - Running HandBrakeCLI: {' '.join(handbrake_args)}")
+        try:
+            run_cmd(handbrake_args)
+            if handbrake_cfr_intermediate_file.exists() and handbrake_cfr_intermediate_file.stat().st_size > 0:
+                print(f"    - HandBrake VFR to CFR conversion successful: {handbrake_cfr_intermediate_file}")
+                current_input_for_utvideo = handbrake_cfr_intermediate_file
+            else:
+                print(f"    - Warning: HandBrakeCLI VFR-to-CFR conversion failed or produced an empty file. Proceeding with original source for UTVideo.")
+                handbrake_cfr_intermediate_file = None # Ensure it's None if failed
+        except subprocess.CalledProcessError as e:
+            print(f"    - Error during HandBrakeCLI execution: {e}")
+            print(f"    - Proceeding with original source for UTVideo.")
+            handbrake_cfr_intermediate_file = None # Ensure it's None if failed
+
+
+    print("    - Creating UTVideo intermediate file (overwriting if exists)...")
+    # Check if source is already UTVideo
+    ffprobe_cmd = [
+        "ffprobe", "-v", "error", "-select_streams", "v:0",
+        "-show_entries", "stream=codec_name", "-of", "default=noprint_wrappers=1:nokey=1",
+        str(current_input_for_utvideo) # Use current input, which might be HandBrake output
+    ]
+    source_codec = run_cmd(ffprobe_cmd, capture_output=True, check=True).strip()
+
+    video_codec_args = ["-c:v", "utvideo"]
+    if source_codec == "utvideo" and current_input_for_utvideo == Path(source_file_full): # Only copy if original was UTVideo
+        print("    - Source is already UTVideo. Copying video stream...")
+        video_codec_args = ["-c:v", "copy"]
+
+    ffmpeg_args = [
+        "ffmpeg", "-hide_banner", "-v", "quiet", "-stats", "-y", "-i", str(current_input_for_utvideo),
+        "-map", "0:v:0", "-map_metadata", "-1", "-map_chapters", "-1", "-an", "-sn", "-dn",
+    ]
+    if autocrop_filter:
+        ffmpeg_args += ["-vf", autocrop_filter]
+    ffmpeg_args += video_codec_args + [str(ut_video_file)]
+    run_cmd(ffmpeg_args)
+
+    print("    - Indexing UTVideo file with ffmsindex for VapourSynth...")
+    ffmsindex_args = ["ffmsindex", "-f", str(ut_video_file)]
+    run_cmd(ffmsindex_args)
+
+    ut_video_full_path = os.path.abspath(ut_video_file)
+    vpy_script_content = f"""import vapoursynth as vs
+core = vs.core
+core.num_threads = 4
+clip = core.ffms2.Source(source=r'''{ut_video_full_path}''')
+clip = core.resize.Point(clip, format=vs.YUV420P10, matrix_in_s="709") # type: ignore
+clip.set_output()
+"""
+    with vpy_file.open("w", encoding="utf-8") as f:
+        f.write(vpy_script_content)
+
+    print("    - Starting AV1 encode with av1an (this will take a long time)...")
+    total_cores = os.cpu_count() or 4 # Fallback if cpu_count is None
+    workers = max(1, (total_cores // 2) - 1) # Half the cores minus one, with a minimum of 1 worker.
+    print(f"    - Using {workers} workers for av1an (Total Cores: {total_cores}, Logic: (Cores/2)-1).")
+
+    # Create the parameter string for av1an's -v option, which expects a single string.
+    av1an_video_params_str = " ".join([f"--{key} {value}" for key, value in SVT_AV1_PARAMS.items()])
+    print(f"    - Using SVT-AV1 parameters: {av1an_video_params_str}")
+
+    av1an_enc_args = [
+        "av1an", "-i", str(vpy_file), "-o", str(encoded_video_file), "-n",
+        "-e", "svt-av1", "--resume", "--sc-pix-format", "yuv420p", "-c", "mkvmerge",
+        "--set-thread-affinity", "2", "--pix-format", "yuv420p10le", "--force", "--no-defaults",
+        "-w", str(workers),
+        "-v", av1an_video_params_str
+    ]
+    run_cmd(av1an_enc_args)
+    print("  --- Finished Video Processing ---")
+    return encoded_video_file, handbrake_cfr_intermediate_file
+
+def is_ffmpeg_decodable(file_path):
+    """Quickly check if ffmpeg can decode the input file."""
+    try:
+        # Try to decode a short segment of the first audio stream
+        subprocess.run([
+            "ffmpeg", "-v", "error", "-i", str(file_path), "-map", "0:a:0", "-t", "1", "-f", "null", "-"
+        ], check=True)
+        return True
+    except subprocess.CalledProcessError:
+        return False
+
+# --- CROPDETECT LOGIC FROM cropdetect.py ---
+import argparse as _argparse_cropdetect
+import multiprocessing as _multiprocessing_cropdetect
+from collections import Counter as _Counter_cropdetect
+
+COLOR_GREEN = "\033[92m"
+COLOR_RED = "\033[91m"
+COLOR_YELLOW = "\033[93m"
+COLOR_RESET = "\033[0m"
+
+KNOWN_ASPECT_RATIOS = [
+    {"name": "HDTV (16:9)", "ratio": 16/9},
+    {"name": "Widescreen (Scope)", "ratio": 2.39},
+    {"name": "Widescreen (Flat)", "ratio": 1.85},
+    {"name": "IMAX Digital (1.90:1)", "ratio": 1.90},
+    {"name": "Fullscreen (4:3)", "ratio": 4/3},
+    {"name": "IMAX 70mm (1.43:1)", "ratio": 1.43},
+]
+
+def _check_prerequisites_cropdetect():
+    for tool in ['ffmpeg', 'ffprobe']:
+        if not shutil.which(tool):
+            print(f"Error: '{tool}' command not found. Is it installed and in your PATH?")
+            return False
+    return True
+
+def _analyze_segment_cropdetect(task_args):
+    seek_time, input_file, width, height = task_args
+    ffmpeg_args = [
+        'ffmpeg', '-hide_banner',
+        '-ss', str(seek_time),
+        '-i', input_file, '-t', '1', '-vf', 'cropdetect',
+        '-f', 'null', '-'
+    ]
+    result = subprocess.run(ffmpeg_args, capture_output=True, text=True, encoding='utf-8')
+    if result.returncode != 0:
+        return []
+    crop_detections = re.findall(r'crop=(\d+):(\d+):(\d+):(\d+)', result.stderr)
+    significant_crops = []
+    for w_str, h_str, x_str, y_str in crop_detections:
+        w, h, x, y = map(int, [w_str, h_str, x_str, y_str])
+        significant_crops.append((f"crop={w}:{h}:{x}:{y}", seek_time))
+    return significant_crops
+
+def _snap_to_known_ar_cropdetect(w, h, x, y, video_w, video_h, tolerance=0.03):
+    if h == 0: return f"crop={w}:{h}:{x}:{y}", None
+    detected_ratio = w / h
+    best_match = None
+    smallest_diff = float('inf')
+    for ar in KNOWN_ASPECT_RATIOS:
+        diff = abs(detected_ratio - ar['ratio'])
+        if diff < smallest_diff:
+            smallest_diff = diff
+            best_match = ar
+    if not best_match or (smallest_diff / best_match['ratio']) >= tolerance:
+        return f"crop={w}:{h}:{x}:{y}", None
+    if abs(w - video_w) < 16:
+        new_h = round(video_w / best_match['ratio'])
+        if new_h % 8 != 0:
+            new_h = new_h + (8 - (new_h % 8))
+        new_h = min(new_h, video_h)
+        new_y = round((video_h - new_h) / 2)
+        if new_y % 2 != 0:
+            new_y -= 1
+        new_y = max(0, new_y)
+        return f"crop={video_w}:{new_h}:0:{new_y}", best_match['name']
+    if abs(h - video_h) < 16:
+        new_w = round(video_h * best_match['ratio'])
+        if new_w % 8 != 0:
+            new_w = new_w + (8 - (new_w % 8))
+        new_w = min(new_w, video_w)
+        new_x = round((video_w - new_w) / 2)
+        if new_x % 2 != 0:
+            new_x -= 1
+        new_x = max(0, new_x)
+        return f"crop={new_w}:{video_h}:{new_x}:0", best_match['name']
+    return f"crop={w}:{h}:{x}:{y}", None
+
+def _cluster_crop_values_cropdetect(crop_counts, tolerance=8):
+    clusters = []
+    temp_counts = crop_counts.copy()
+    while temp_counts:
+        center_str, _ = temp_counts.most_common(1)[0]
+        try:
+            _, values = center_str.split('=');
+            cw, ch, cx, cy = map(int, values.split(':'))
+        except (ValueError, IndexError):
+            del temp_counts[center_str]
+            continue
+        cluster_total_count = 0
+        crops_to_remove = []
+        for crop_str, count in temp_counts.items():
+            try:
+                _, values = crop_str.split('=');
+                w, h, x, y = map(int, values.split(':'))
+                if abs(x - cx) <= tolerance and abs(y - cy) <= tolerance:
+                    cluster_total_count += count
+                    crops_to_remove.append(crop_str)
+            except (ValueError, IndexError):
+                continue
+        if cluster_total_count > 0:
+            clusters.append({'center': center_str, 'count': cluster_total_count})
+        for crop_str in crops_to_remove:
+            del temp_counts[crop_str]
+    clusters.sort(key=lambda c: c['count'], reverse=True)
+    return clusters
+
+def _parse_crop_string_cropdetect(crop_str):
+    try:
+        _, values = crop_str.split('=');
+        w, h, x, y = map(int, values.split(':'))
+        return {'w': w, 'h': h, 'x': x, 'y': y}
+    except (ValueError, IndexError):
+        return None
+
+def _calculate_bounding_box_cropdetect(crop_keys):
+    min_x = min_w = min_y = min_h = float('inf')
+    max_x = max_w = max_y = max_h = float('-inf')
+    for key in crop_keys:
+        parsed = _parse_crop_string_cropdetect(key)
+        if not parsed:
+            continue
+        w, h, x, y = parsed['w'], parsed['h'], parsed['x'], parsed['y']
+        min_x = min(min_x, x)
+        min_y = min(min_y, y)
+        max_x = max(max_x, x + w)
+        max_y = max(max_y, y + h)
+        min_w = min(min_w, w)
+        min_h = min(min_h, h)
+        max_w = max(max_w, w)
+        max_h = max(max_h, h)
+    if (max_x - min_x) <= 2 and (max_y - min_y) <= 2:
+        return None
+    bounding_crop = f"crop={max_x - min_x}:{max_y - min_y}:{min_x}:{min_y}"
+    return bounding_crop
+
+def _analyze_video_cropdetect(input_file, duration, width, height, num_workers, significant_crop_threshold, min_crop, debug=False):
+    num_tasks = num_workers * 4
+    segment_duration = max(1, duration // num_tasks)
+    tasks = [(i * segment_duration, input_file, width, height) for i in range(num_tasks)]
+    crop_results = []
+    with _multiprocessing_cropdetect.Pool(processes=num_workers) as pool:
+        results_iterator = pool.imap_unordered(_analyze_segment_cropdetect, tasks)
+        for result in results_iterator:
+            crop_results.append(result)
+    all_crops_with_ts = [crop for sublist in crop_results for crop in sublist]
+    all_crop_strings = [item[0] for item in all_crops_with_ts]
+    if not all_crop_strings:
+        return None
+    crop_counts = _Counter_cropdetect(all_crop_strings)
+    clusters = _cluster_crop_values_cropdetect(crop_counts)
+    total_detections = sum(c['count'] for c in clusters)
+    significant_clusters = []
+    for cluster in clusters:
+        percentage = (cluster['count'] / total_detections) * 100
+        if percentage >= significant_crop_threshold:
+            significant_clusters.append(cluster)
+    for cluster in significant_clusters:
+        parsed_crop = _parse_crop_string_cropdetect(cluster['center'])
+        if parsed_crop:
+            _, ar_label = _snap_to_known_ar_cropdetect(
+                parsed_crop['w'], parsed_crop['h'], parsed_crop['x'], parsed_crop['y'], width, height
+            )
+            cluster['ar_label'] = ar_label
+        else:
+            cluster['ar_label'] = None
+    if not significant_clusters:
+        return None
+    elif len(significant_clusters) == 1:
+        dominant_cluster = significant_clusters[0]
+        parsed_crop = _parse_crop_string_cropdetect(dominant_cluster['center'])
+        snapped_crop, ar_label = _snap_to_known_ar_cropdetect(
+            parsed_crop['w'], parsed_crop['h'], parsed_crop['x'], parsed_crop['y'], width, height
+        )
+        parsed_snapped = _parse_crop_string_cropdetect(snapped_crop)
+        if parsed_snapped and parsed_snapped['w'] == width and parsed_snapped['h'] == height:
+            return None
+        else:
+            return snapped_crop
+    else:
+        crop_keys = [c['center'] for c in significant_clusters]
+        bounding_box_crop = _calculate_bounding_box_cropdetect(crop_keys)
+        if bounding_box_crop:
+            parsed_bb = _parse_crop_string_cropdetect(bounding_box_crop)
+            snapped_crop, ar_label = _snap_to_known_ar_cropdetect(
+                parsed_bb['w'], parsed_bb['h'], parsed_bb['x'], parsed_bb['y'], width, height
+            )
+            parsed_snapped = _parse_crop_string_cropdetect(snapped_crop)
+            if parsed_snapped and parsed_snapped['w'] == width and parsed_snapped['h'] == height:
+                return None
+            else:
+                return snapped_crop
+        else:
+            return None
+
+def detect_autocrop_filter(input_file, significant_crop_threshold=5.0, min_crop=10, debug=False):
+    if not _check_prerequisites_cropdetect():
+        return None
+    try:
+        probe_duration_args = [
+            'ffprobe', '-v', 'error', '-show_entries', 'format=duration', '-of', 'default=noprint_wrappers=1:nokey=1',
+            input_file
+        ]
+        duration_str = subprocess.check_output(probe_duration_args, stderr=subprocess.STDOUT, text=True)
+        duration = int(float(duration_str))
+        probe_res_args = [
+            'ffprobe', '-v', 'error',
+            '-select_streams', 'v',
+            '-show_entries', 'stream=width,height,disposition',
+            '-of', 'json',
+            input_file
+        ]
+        probe_output = subprocess.check_output(probe_res_args, stderr=subprocess.STDOUT, text=True)
+        streams_data = json.loads(probe_output)
+        video_stream = None
+        for stream in streams_data.get('streams', []):
+            if stream.get('disposition', {}).get('attached_pic', 0) == 0:
+                video_stream = stream
+                break
+        if not video_stream or 'width' not in video_stream or 'height' not in video_stream:
+            return None
+        width = int(video_stream['width'])
+        height = int(video_stream['height'])
+    except Exception:
+        return None
+    return _analyze_video_cropdetect(input_file, duration, width, height, max(1, os.cpu_count() // 2), significant_crop_threshold, min_crop, debug)
+
+def main(no_downmix=False, autocrop=False, speed=None, quality=None, grain=None):
+    check_tools()
+
+    # Override default SVT-AV1 params if provided via command line
+    if speed:
+        SVT_AV1_PARAMS["speed"] = speed
+    if quality:
+        SVT_AV1_PARAMS["quality"] = quality
+    if grain is not None:
+        SVT_AV1_PARAMS["film-grain"] = grain
+
+    current_dir = Path(".")
+    files_to_process = sorted(
+        f for f in current_dir.glob("*.mkv")
+        if not (f.name.endswith(".ut.mkv") or f.name.startswith("temp-") or f.name.startswith("output-") or f.name.endswith(".cfr_temp.mkv"))
+    )
+    if not files_to_process:
+        print("No MKV files found to process. Exiting.")
+        return
+    DIR_COMPLETED.mkdir(exist_ok=True, parents=True)
+    DIR_ORIGINAL.mkdir(exist_ok=True, parents=True)
+    DIR_CONV_LOGS.mkdir(exist_ok=True, parents=True)
+    while True:
+        files_to_process = sorted(
+            f for f in current_dir.glob("*.mkv")
+            if not (f.name.endswith(".ut.mkv") or f.name.startswith("temp-") or f.name.startswith("output-") or f.name.endswith(".cfr_temp.mkv"))
+        )
+        if not files_to_process:
+            print("No more .mkv files found to process in the current directory. The script will now exit.")
+            break
+        file_path = files_to_process[0]
+        if not is_ffmpeg_decodable(file_path):
+            print(f"ERROR: ffmpeg cannot decode '{file_path.name}'. Skipping this file.", file=sys.stderr)
+            shutil.move(str(file_path), DIR_ORIGINAL / file_path.name)
+            continue
+        print("-" * shutil.get_terminal_size(fallback=(80, 24)).columns)
+        log_file_name = f"{file_path.stem}.log"
+        log_file_path = DIR_CONV_LOGS / log_file_name
+        original_stdout_console = sys.stdout
+        original_stderr_console = sys.stderr
+        print(f"Processing: {file_path.name}", file=original_stdout_console)
+        print(f"Logging output to: {log_file_path}", file=original_stdout_console)
+        log_file_handle = None
+        processing_error_occurred = False
+        date_for_runtime_calc = datetime.now()
+        try:
+            log_file_handle = open(log_file_path, 'w', encoding='utf-8')
+            sys.stdout = log_file_handle
+            sys.stderr = log_file_handle
+            print(f"STARTING LOG FOR: {file_path.name}")
+            print(f"Processing started at: {date_for_runtime_calc}")
+            print(f"Full input file path: {file_path.resolve()}")
+            print("-" * shutil.get_terminal_size(fallback=(80, 24)).columns)
+            input_file_abs = file_path.resolve()
+            intermediate_output_file = current_dir / f"output-{file_path.name}"
+            audio_temp_dir = None
+            handbrake_intermediate_for_cleanup = None
+            try:
+                audio_temp_dir = tempfile.mkdtemp(prefix="anime_audio_")
+                print(f"Audio temporary directory created at: {audio_temp_dir}")
+                print(f"Analyzing file: {input_file_abs}")
+                ffprobe_info_json = run_cmd([
+                    "ffprobe", "-v", "quiet", "-print_format", "json", "-show_streams", "-show_format", str(input_file_abs)
+                ], capture_output=True)
+                ffprobe_info = json.loads(ffprobe_info_json)
+                mkvmerge_info_json = run_cmd([
+                    "mkvmerge", "-J", str(input_file_abs)
+                ], capture_output=True)
+                mkv_info = json.loads(mkvmerge_info_json)
+                mediainfo_json = run_cmd([
+                    "mediainfo", "--Output=JSON", "-f", str(input_file_abs)
+                ], capture_output=True)
+                media_info = json.loads(mediainfo_json)
+                is_vfr = False
+                target_cfr_fps_for_handbrake = None
+                video_track_info = None
+                if media_info.get("media") and media_info["media"].get("track"):
+                    for track in media_info["media"]["track"]:
+                        if track.get("@type") == "Video":
+                            video_track_info = track
+                            break
+                if video_track_info:
+                    frame_rate_mode = video_track_info.get("FrameRate_Mode")
+                    if frame_rate_mode and frame_rate_mode.upper() in ["VFR", "VARIABLE"]:
+                        is_vfr = True
+                        print(f"    - Detected VFR based on MediaInfo FrameRate_Mode: {frame_rate_mode}")
+                        original_fps_str = video_track_info.get("FrameRate_Original_String")
+                        if original_fps_str:
+                            match = re.search(r'\((\d+/\d+)\)', original_fps_str)
+                            if match:
+                                target_cfr_fps_for_handbrake = match.group(1)
+                            else:
+                                target_cfr_fps_for_handbrake = video_track_info.get("FrameRate_Original")
+                        if not target_cfr_fps_for_handbrake:
+                            target_cfr_fps_for_handbrake = video_track_info.get("FrameRate_Original")
+                        if not target_cfr_fps_for_handbrake:
+                            target_cfr_fps_for_handbrake = video_track_info.get("FrameRate")
+                            if target_cfr_fps_for_handbrake:
+                                print(f"    - Using MediaInfo FrameRate ({target_cfr_fps_for_handbrake}) as fallback for HandBrake target FPS.")
+                        if target_cfr_fps_for_handbrake:
+                            print(f"    - Target CFR for HandBrake: {target_cfr_fps_for_handbrake}")
+                            if isinstance(target_cfr_fps_for_handbrake, str) and "/" in target_cfr_fps_for_handbrake:
+                                try:
+                                    num, den = map(float, target_cfr_fps_for_handbrake.split('/'))
+                                    target_cfr_fps_for_handbrake = f"{num / den:.3f}"
+                                    print(f"    - Converted fractional FPS to decimal for HandBrake: {target_cfr_fps_for_handbrake}")
+                                except ValueError:
+                                    print(f"    - Warning: Could not parse fractional FPS '{target_cfr_fps_for_handbrake}'. HandBrakeCLI might fail.")
+                                    is_vfr = False
+                        else:
+                            print("    - Warning: VFR detected, but could not determine target CFR from MediaInfo. Will attempt standard UTVideo conversion without HandBrake.")
+                            is_vfr = False
+                    else:
+                        print(f"    - Video appears to be CFR or FrameRate_Mode not specified as VFR/Variable by MediaInfo.")
+                autocrop_filter = None
+                if autocrop:
+                    print("--- Running autocrop detection ---")
+                    autocrop_filter = detect_autocrop_filter(str(input_file_abs))
+                    if autocrop_filter:
+                        print(f"    - Autocrop filter detected: {autocrop_filter}")
+                    else:
+                        print("    - No crop needed or detected.")
+                encoded_video_file, handbrake_intermediate_for_cleanup = convert_video(
+                    file_path.stem, str(input_file_abs), is_vfr, target_cfr_fps_for_handbrake, autocrop_filter=autocrop_filter
+                )
+
+                print("--- Starting Audio Processing ---")
+                processed_audio_files = []
+                audio_tracks_to_remux = []
+                audio_streams = [s for s in ffprobe_info.get("streams", []) if s.get("codec_type") == "audio"]
+
+                # Build mkvmerge track mapping by track ID
+                mkv_audio_tracks = {t["id"]: t for t in mkv_info.get("tracks", []) if t.get("type") == "audio"}
+
+                # Build mediainfo track mapping by StreamOrder
+                media_tracks_data = media_info.get("media", {}).get("track", [])
+                mediainfo_audio_tracks = {int(t.get("StreamOrder", -1)): t for t in media_tracks_data if t.get("@type") == "Audio"}
+
+                for stream in audio_streams:
+                    stream_index = stream["index"]
+                    codec = stream.get("codec_name")
+                    channels = stream.get("channels", 2)
+                    language = stream.get("tags", {}).get("language", "und")
+
+                    # Find mkvmerge track by matching ffprobe stream index to mkvmerge track's 'properties'->'stream_id'
+                    mkv_track = None
+                    for t in mkv_info.get("tracks", []):
+                        if t.get("type") == "audio" and t.get("properties", {}).get("stream_id") == stream_index:
+                            mkv_track = t
+                            break
+                    if not mkv_track:
+                        # Fallback: try by position
+                        mkv_track = mkv_info.get("tracks", [])[stream_index] if stream_index < len(mkv_info.get("tracks", [])) else {}
+
+                    track_id = mkv_track.get("id", -1)
+                    track_title = mkv_track.get("properties", {}).get("track_name", "")
+
+                    # Find mediainfo track by StreamOrder
+                    audio_track_info = mediainfo_audio_tracks.get(stream_index)
+                    track_delay = 0
+                    delay_raw = audio_track_info.get("Video_Delay") if audio_track_info else None
+                    if delay_raw is not None:
+                        try:
+                            delay_val = float(delay_raw)
+                            # If the value is a float < 1, it's seconds, so convert to ms.
+                            if delay_val < 1:
+                                track_delay = int(round(delay_val * 1000))
+                            else:
+                                track_delay = int(round(delay_val))
+                        except Exception:
+                            track_delay = 0
+
+                    print(f"Processing Audio Stream #{stream_index} (TID: {track_id}, Codec: {codec}, Channels: {channels})")
+                    if codec in REMUX_CODECS:
+                        audio_tracks_to_remux.append(str(track_id))
+                    else:
+                        # Convert any codec that is not in REMUX_CODECS
+                        opus_file = convert_audio_track(
+                            stream_index, channels, language, audio_temp_dir, str(input_file_abs), not no_downmix
+                        )
+                        processed_audio_files.append({
+                            "Path": opus_file,
+                            "Language": language,
+                            "Title": track_title,
+                            "Delay": track_delay
+                        })
+
+                print("--- Finished Audio Processing ---")
+
+                # Final mux
+                print("Assembling final file with mkvmerge...")
+                mkvmerge_args = ["mkvmerge", "-o", str(intermediate_output_file), str(encoded_video_file)]
+                for file_info in processed_audio_files:
+                    sync_switch = ["--sync", f"0:{file_info['Delay']}"] if file_info["Delay"] else []
+                    mkvmerge_args += [
+                        "--language", f"0:{file_info['Language']}",
+                        "--track-name", f"0:{file_info['Title']}"
+                    ] + sync_switch + [str(file_info["Path"])]
+
+                source_copy_args = ["--no-video"]
+                if audio_tracks_to_remux:
+                    source_copy_args += ["--audio-tracks", ",".join(audio_tracks_to_remux)]
+                else:
+                    source_copy_args += ["--no-audio"]
+                mkvmerge_args += source_copy_args + [str(input_file_abs)]
+                run_cmd(mkvmerge_args)
+
+                # Move files
+                print("Moving files to final destinations...")
+                shutil.move(str(file_path), DIR_ORIGINAL / file_path.name)
+                shutil.move(str(intermediate_output_file), DIR_COMPLETED / file_path.name)
+
+                print("Cleaning up persistent video temporary files (after successful processing)...")
+                video_temp_files_on_success = [
+                    current_dir / f"{file_path.stem}.vpy",
+                    current_dir / f"{file_path.stem}.ut.mkv",
+                    current_dir / f"temp-{file_path.stem}.mkv", # This is encoded_video_file
+                    current_dir / f"{file_path.stem}.ut.mkv.lwi", 
+                    current_dir / f"{file_path.stem}.ut.mkv.ffindex",
+                ]
+                if handbrake_intermediate_for_cleanup and handbrake_intermediate_for_cleanup.exists():
+                    video_temp_files_on_success.append(handbrake_intermediate_for_cleanup)
+                
+                for temp_vid_file in video_temp_files_on_success:
+                    if temp_vid_file.exists():
+                        print(f"    Deleting: {temp_vid_file}")
+                        temp_vid_file.unlink(missing_ok=True)
+                    else:
+                        print(f"    Skipping (not found): {temp_vid_file}")
+
+            except Exception as e:
+                print(f"ERROR: An error occurred while processing '{file_path.name}': {e}", file=sys.stderr) # Goes to log
+                original_stderr_console.write(f"ERROR during processing of '{file_path.name}': {e}\nSee log '{log_file_path}' for details.\n")
+                processing_error_occurred = True
+            finally:
+                # This is the original 'finally' block. Its prints go to the log file.
+                print("--- Starting Universal Cleanup (for this file) ---")
+                print("  - Cleaning up disposable audio temporary directory...")
+                if audio_temp_dir and Path(audio_temp_dir).exists():
+                    shutil.rmtree(audio_temp_dir, ignore_errors=True)
+                    print(f"    - Deleted audio temp dir: {audio_temp_dir}")
+                elif audio_temp_dir: # Was created but now not found
+                    print(f"    - Audio temp dir not found or already cleaned: {audio_temp_dir}")
+                else: # Was never created
+                    print(f"    - Audio temp dir was not created.")
+                
+                print("  - Cleaning up intermediate output file (if it wasn't moved on success)...")
+                if intermediate_output_file.exists(): # Check if it still exists (e.g. error before move)
+                    if processing_error_occurred:
+                        print(f"    - WARNING: Processing error occurred. Intermediate output file '{intermediate_output_file}' is being preserved at its original path for inspection.")
+                    else:
+                        # No processing error, so it should have been moved.
+                        # If it's still here, it's unexpected but we'll clean it up.
+                        print(f"    - INFO: Intermediate output file '{intermediate_output_file}' found at original path despite no errors (expected to be moved). Cleaning up.")
+                        intermediate_output_file.unlink(missing_ok=True) # Only unlink if no error and it exists
+                        print(f"    - Deleted intermediate output file from original path: {intermediate_output_file}")
+                else:
+                    # File does not exist at original path
+                    if not processing_error_occurred:
+                        print(f"    - Intermediate output file successfully moved (not found at original path, as expected): {intermediate_output_file}")
+                    else:
+                        print(f"    - Processing error occurred, and intermediate output file '{intermediate_output_file}' not found at original path (likely not created or cleaned by another step).")
+            # --- End of original per-file processing block ---
+
+            print(f"FINISHED LOG FOR: {file_path.name}")
+            # --- End of log-specific messages ---
+
+        finally: # Outer finally for restoring stdout/stderr and closing log file
+            runtime = datetime.now() - date_for_runtime_calc
+            runtime_str = str(runtime).split('.')[0]
+            
+            # This print goes to the log file, as stdout is not yet restored.
+            print(f"\nTotal runtime for this file: {runtime_str}")
+            
+            if sys.stdout != original_stdout_console:
+                sys.stdout = original_stdout_console
+            if sys.stderr != original_stderr_console:
+                sys.stderr = original_stderr_console
+            if log_file_handle:
+                log_file_handle.close()
+            
+            # Announce to console (original stdout/stderr) that this file is done
+            if processing_error_occurred:
+                original_stderr_console.write(f"File: {file_path.name}\n")
+                original_stderr_console.write(f"Log: {log_file_path}\n")
+                original_stderr_console.write(f"Runtime: {runtime_str}\n")
+            else:
+                original_stdout_console.write(f"File: {file_path.name}\n")
+                original_stdout_console.write(f"Log: {log_file_path}\n")
+                original_stdout_console.write(f"Runtime: {runtime_str}\n")
+
+if __name__ == "__main__":
+    import argparse
+    parser = argparse.ArgumentParser(description="Batch-process MKV files with resumable video encoding, audio downmixing, per-file logging, and optional autocrop.")
+    parser.add_argument("--no-downmix", action="store_true", help="Preserve original audio channel layout.")
+    parser.add_argument("--autocrop", action="store_true", help="Automatically detect and crop black bars from video using cropdetect.")
+    parser.add_argument("--speed", type=str, help="Set the encoding speed. Possible values: slower, slow, medium, fast, faster.")
+    parser.add_argument("--quality", type=str, help="Set the encoding quality. Possible values: lowest, low, medium, high, higher.")
+    parser.add_argument("--grain", type=int, help="Set the film-grain value (number). Adjusts the film grain synthesis level.")
+    args = parser.parse_args()
+    main(no_downmix=args.no_downmix, autocrop=args.autocrop, speed=args.speed, quality=args.quality, grain=args.grain)

tv_audio_encoder.py

@@ -90,14 +90,16 @@ def convert_audio_track(index, ch, lang, audio_temp_dir, source_file, should_dow
     else:
         # Not downmixing (or source is already stereo or less).
         # Base bitrate on the source channel count.
-        if ch == 2:      # Stereo
+        if ch == 1:      # Mono
+            bitrate = "64k"
+        elif ch == 2:    # Stereo
             bitrate = "128k"
         elif ch == 6:    # 5.1 Surround
             bitrate = "256k"
         elif ch == 8:    # 7.1 Surround
             bitrate = "384k"
-        else:            # Mono or other layouts
-            bitrate = "96k" # A sensible default for mono.
+        else:            # Other layouts
+            bitrate = "96k" # A sensible default for other/uncommon layouts.
 
     print(f"    - Encoding Audio Track #{index} to Opus at {bitrate}...")
     run_cmd([