ffmpeg -i original_movie.mkv -map 0:v -c:v copy -map 0:a:0 -c:a ac3 -b:a 640k -map 0:s? -c:s copy output_ac3.mkv
For advanced users, FFmpeg is the most powerful command-line repair tool. If your MKV has audio drift (sync error), this is the solution.
Command to fix sync:
ffmpeg -i input_broken.mkv -c copy -map 0 -metadata:s:a:0 delay=500ms output_fixed.mkv
(The 500ms value adjusts audio delay – use negative numbers for audio playing too early.) mkv com movies fixed
Command to force re-encoding of broken frames: ffmpeg -i original_movie
ffmpeg -i input_broken.mkv -c:v libx264 -c:a aac output_fixed.mkv
(Warning: This re-encodes the video, losing quality and taking hours. Use only as a last resort.) For advanced users, FFmpeg is the most powerful
Many "mkv com movies" are partial downloads. If your file size seems smaller than expected:
mkvmerge -o fixed_movie.mkv original_movie.mkv
mkvextract tracks original_movie.mkv 1:video.h264 2:audio.ac3 3:subs.srt
mkvmerge -o fixed_movie.mkv video.h264 audio.ac3 subs.srt