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avimux - GStreamer
https://gstreamer.freedesktop.org/documentation/avi/avimux.html
avimux Muxes raw or compressed audio and/or video streams into an AVI file. Example launch lines (write everything in one line, without the backslash characters) gst-launch-1.0 videotestsrc num-buffers=250 \ ! 'video/x-raw,format=(string)I420,width=320,height=240,framerate=(fraction)25/1' \ ! queue ! mux. \
Avidemux Documentation -- Audio
http://avidemux.sourceforge.net/doc/en/audio.xml.html
Audio 1. Process/Copy mode Copy mode In that mode, avidemux will just copy the audio source (external/avi/...) to the output. It is used when you just cut an avi for example or change the audio track.That also applies to mpeg encoding/transcoding/requantizing. Process mode Avidemux will first decompress the audio, then apply the filters if any.
tutorial:save_only_audio [Avidemux]
https://www.avidemux.org/admWiki/doku.php?id=tutorial:save_only_audio
From the side panel, Audio section, choose the audio codec you want to use (nbsp) (ndash) e.g. MP3, Vorbis, WAV, AAC, or Copy if you just want to extract a piece of the original soundtrack. Configure the options for your audio codec using the Configure button. Go the menu: Audio → Save. Save the audio file.
Add audio to video (or replace it) in Avidemux. - YouTube
https://www.youtube.com/watch?v=ckFwE3jPNBY
Avidemux 2.6 and 2.7: append audio to a video or replace it - change it without re-encoding using Avidemux. Video with new audio is encoded as .avi or .mp4 o...
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