[FFmpeg-user] Replacing First 90 Seconds of a Video with Silence or with Another Audio Clip
rwilliams at busivid.com
Tue Jan 19 04:02:02 CET 2016
On Tuesday, 19 January 2016 02:13 Sam Logan <shapableline at 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:
> 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).
> 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.
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