On Tuesday, 19 January 2016 02:13 Sam Logan <shapablel...@gmail.com> wrote:
> I have a video AVI file, "Video.avi", consisting of a video and an > audio track, and a separate audio file, "Audio.mp3". I want to do the > following two things: > > (1) > > First, I want to produce a version of the video, "OutputSilenced.avi", > which would be identical to the original video except that the first > 90 seconds of the video's audio are replaced with silence (to clarify, > I want to REPLACE, as in overwrite, the first 90 seconds, NOT insert > 90 seconds of silence to push the audio back 90 seconds). > -af "volume=enable='lte(t,90)':volume=0" http://ffmpeg.org/ffmpeg-filters.html#volume http://ffmpeg.org/ffmpeg-filters.html#Timeline-editing > (2) > > Second, I want to produce a version of the video, > "OutputReplaced.avi", which would be identical to the original video > except that the first 90 seconds of the video's audio are replaced > with the first 90 seconds of "Audio.mp3" (again, to be clear, I want > to REPLACE, as in overwrite, the first 90 seconds, NOT insert 90 > seconds of audio to push the original audio back 90 seconds). > > How commands would I use to do this with FFmpeg? Ideally, I would like > to just remux without doing any re-encoding. Thanks in advance. Only way I can think of is to use a combination of the volume filter above to suppress the audio form the video and chain it with 'amix' to create a new audio track. If you run into volume level problems using 'amix' try a combination of 'amerge' to make it a 4 channel track then 'pan' to change it back into stereo. http://ffmpeg.org/ffmpeg-filters.html#amix http://ffmpeg.org/ffmpeg-filters.html#amerge-1 http://ffmpeg.org/ffmpeg-filters.html#pan _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
