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From a video discussion forum a bash/shell script that uses ffmpeg: ffmpeg -loglevel info -y -i "$file" -map 0 -c copy -c:a ac3 -filter:a aresample=resampler=soxr,asetrate=46033.92 -ar 48000 tmp.mkv mkvmerge -o "$outfile" --default-duration 0:23.976fps tmp.mkvIn this person's example the change in video speed is lossless, only the metadata gets updated.