Simon van Bernem via ffmpeg-user <ffmpeg-user@ffmpeg.org> writes: > Those look very promising, but my version of ffmpeg doesn'tknow the segment > filter. I found it in the changelog for version5, but the website lets me > only download 4.4 and the github'slast release is 3.0 from 2016. Is the > segment filter not availablefor the general public yet? > Regards,Simon > > Am Sonntag, 9. Januar 2022, 15:53:27 MEZ hat Nicolas George > <geo...@nsup.org> Folgendes geschrieben: > > Simon van Bernem via ffmpeg-user (12022-01-08): >> Hi, >> I am trying to remove parts of a video (with audio) using the select >> filter. I constructed this command to remove seconds 20-25: >> >> (newlines only for readability) >> >> ffmpeg -i input.mkv >> -vf "select='1-between(t,20,25)', setpts=N/FRAME_RATE/TB" >> -af "aselect='1-between(t,20,25)', asetpts=N/SR/TB" output.mkv >> >> This works great, except that when I use multiple "between" clauses >> to discard multiple sections, audio and video will start to get out of >> sync. > > The select filter is very generic, and therefore not very robust. It > does not update the timestamps, hence the need to update them > afterwards. Furthermore, it works with whole frames, which can > accumulate for audio. > > For your use case, consider the segment and concat filters.
If you do not want any re-coding, then I suggest using the concat muxer. I use this for cutting editing screencasts before adding chapter markers, etc., and doing a transcoding. See section 20.5 of the ffmpeg manual. https://ffmpeg.org/ffmpeg-all.html#toc-concat-1 Otherwise, as Nicolas says, use the concat filter with multiple inputs, e.g. ffmpeg -ss time1 -t duration1 input1 -ss time2 -t duration2 input2 ...concat=n=2:v=1:a=1... Leo _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
