Reverted Backup to working function

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", "opusenc", "mediainfo"]
+    required_tools = ["ffmpeg", "ffprobe", "mkvmerge", "sox_ng", "opusenc", "mediainfo"]
     print("--- Prerequisite Check ---")
     all_found = True
     for tool in required_tools:
@@ -78,40 +78,9 @@ 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 ffmpeg's loudnorm (2-pass)
-    print("    - Normalizing with ffmpeg (loudnorm 2-pass)...")
-    # First pass: Analyze the audio to get loudnorm stats
-    print("      - Pass 1: Analyzing...")
-    result = subprocess.run(
-        ["ffmpeg", "-v", "info", "-i", str(temp_extracted), "-af", "loudnorm=I=-18:LRA=7:tp=-1:print_format=json", "-f", "null", "-"],
-        capture_output=True, text=True, check=True)
-    
-    # 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=-18: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)
-    ])
+    # Step 2: Normalize the track with SoX
+    print("    - Normalizing with SoX...")
+    run_cmd(["sox_ng", "--show-progress", str(temp_extracted), str(temp_normalized), "--temp", str(temp_dir), "loudness", "-18"])
 
     # Step 3: Encode to Opus with the correct bitrate
     bitrate = "192k"  # Fallback