diff --git a/anime_audio_helper.py b/anime_audio_helper.py
index cc74499..4dc9d56 100755
--- a/anime_audio_helper.py
+++ b/anime_audio_helper.py
@@ -21,7 +21,7 @@ REMUX_CODECS = {"aac", "opus"}  # Using a set for efficient lookups
 
 SVT_AV1_PARAMS = {
     "speed": "slower",  # "slower", "slow", "medium", "fast", "faster"
-    "quality": "medium",  # "lowest", "low",  # "higher", "high", "medium", "low", "lower"
+    "quality": "medium",  # "lowest", "low,  # "higher", "high", "medium", "low", "lower"
     "film-grain": 6,
     "color-primaries": 1,
     "transfer-characteristics": 1,
@@ -53,7 +53,7 @@ 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:
@@ -81,14 +81,16 @@ 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 layouts.
 
     print(f"    - Encoding Audio Track #{index} to Opus at {bitrate}...")
     run_cmd([