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FFmpeg recipe : combine separate audio and video - LinuxPip
https://linuxpip.org/ffmpeg-combine-audio-video/#:~:text=If%20your%20video%20file%20already%20contains%20one%20or,the%20input%2Finputs%20to%20be%20included%20in%20the%20output%2Foutputs.
ffmpeg - How to replace an audio stream in a video file ...
https://superuser.com/questions/800234/how-to-replace-an-audio-stream-in-a-video-file-with-multiple-audio-streams
Replace second audio stream. ffmpeg -i video.mkv -i audio.mp3 -map 0:v -map 0:a:0 -map 1:a \ -metadata:s:a:0 language=eng -metadata:s:a:1 language=sme -codec copy \ -shortest output.mkv 0:v – The 0 refers to the first input which is video.mkv. The v means "select video stream type". 0:a:0 – The 0 refers to the first input which is video.mkv.
How to replace a video's audio with FFMPEG - Flying Sound
https://flyingsound.net/about/articles/replace-video-audio-ffmpeg/
The short answer is install FFMPEG and use this command: ffmpeg -i source_video.mp4 -i source_audio.wav -acodec copy -vcodec copy -map 0:v:0 -map 1:a:0 final_video.mov. Now lets break it down. MacOS. FFMPEG is a a terminal program, so you’ll need to go to the Utillities folder inside of the applications folder and install homebrew. Then:
Replacing video audio using ffmpeg | Ochre
https://ochremusic.com/2016/07/05/replacing-video-audio-using-ffmpeg/
In Windows 10, you can shift-right click in the Explorer directory that houses your video file to open a command window (just select the very handy 'Open command window here' option). Firstly, if you'd like to strip the audio from a video file, you can use this command: ffmpeg -i INPUT.mp4 -codec copy -an OUTPUT.mp4
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