On 01/18/2016 10:02 PM, Ryan Williams wrote:
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 step 1) Stop being a tool with the all caps. be polite You catch more flies with honey, than you do with vinegar. step 2) grab just the audio from your video 90 seconds in: ffmpeg -ss 00:01:30 -i in.mp4 -vn out.mp3 step 3) concat your audio.mp3 with the out.mp3 you just made ffmpeg -i "concat:audio.mp3|out.mp3" -c copy all.mp3 step 4) take the video stream from the original video and mux in all.mp3 ffmpeg -i in.mp4 -i all.mp3 -map 0:0 -map 1:0 -c copy done.mp4 step 5) record a blank 90 secs of audio and repeat the steps 3 and 4 with it instead of audio.mp3. _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
