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ffmpeg Documentation
https://ffmpeg.org/ffmpeg.html#:~:text=Its%20audio%20counterpart%20is%20the%20amix%20filter.%20Stream,changing%20the%20container%20format%20or%20modifying%20container-level%20metadata.
Ffmpeg to duplicate an audio stream and encode this …
https://stackoverflow.com/questions/21567029/ffmpeg-to-duplicate-an-audio-stream-and-encode-this-new-stream
This command will take a video with 1 audio stream, and downmix to stereo and convert the audio stream and add it as a 2nd audio stream. It will be in AAC 384k. ffmpeg -i INPUT.mkv -strict -2 -map 0 -c copy -map 0:a:0 -c:a:1 aac -b:a 384k -ac 2 OUTPUT.mkv. Explanation of the command. ffmpeg -i INPUT.mkv The application and input file
ffmpeg Documentation
https://ffmpeg.org/ffmpeg.html
3.2 Stream copy. Stream copy is a mode selected by supplying the copy parameter to the -codec option. It makes ffmpeg omit the decoding and encoding step for the specified stream, so it does only demuxing and muxing. It is useful for changing the container format or modifying container-level metadata.
How to Extract Audio from Video Using FFmpeg
https://www.leawo.org/entips/how-to-extract-audio-from-video-using-ffmpeg-1400.html
From other questions about this topic I learned that ffmpeg is a right tool to do this. I tried to use the following command: ‘ffmpeg -i video.mp4 -acodec copy -ss 00:30:00 -to 00:60:00 extract.mp3’. But it fails and says ‘[mp3 @ 0x3bfade0] Invalid audio stream. Exactly one MP3 audio stream is required.
How can I extract audio from video with ffmpeg? - Stack ...
https://stackoverflow.com/questions/9913032/how-can-i-extract-audio-from-video-with-ffmpeg
Extract a specific audio track / stream. Example to extract audio stream #4: ffmpeg -i input.mkv -map 0:a:3 -c copy output.m4a -map 0:a:3 selects audio stream #4 only (ffmpeg starts counting from 0).-c copy enables stream copy mode. This copies the audio and does not re-encode it. Remove -c copy if you want the audio to be re-encoded.
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