Fix transcoder: convert subs to SRT instead of copy (fixes mov_text → MKV failures)

overnight_transcoder.py

@@ -654,7 +654,7 @@ def transcode_file(input_path: str, conn: sqlite3.Connection) -> Optional[dict]:
         "-x265-params", f"pools={CONFIG['threads']}",
         "-c:a", CONFIG["audio_codec"],
         "-b:a", CONFIG["audio_bitrate"],
-        "-c:s", "copy",  # Copy subtitles
+        "-c:s", "srt",  # Convert subtitles to SRT (mov_text from MP4 cant copy to MKV)
         str(output_path)
     ]