I got a problem with playback of some MKV containers (89 items, totalling 196,3 GB).
The audio+video are encoded in 25 fps, but the subs are totally out of sync - these are encoded on 23.976 fps.
My question: Is there anyway i can batch change/reencode the framerate on these movies to 23.976?
Answer
You can try recoding the video and audio to a different frame rate while keeping the subtitles as they are:
ffmpeg -i input.mkv -c:v libx264 -crf 21 -c:a aac -strict experimental -b:a 128k -r 23.98 -c:s copy output.mkv
The CRF sets the video quality. Choose something lower for even better quality, like 18. 23 is the default for x264.
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