ffmpeg.exe -i input_video.mp4 -i replacement_audio.m4a -vcodec copy -acodec copy -map 0:0 -map 1:0 output.mp4 https://superuser.com/questions/602662/how-do-i-replace-the-audio-in-an-mp4-file-without-re-encoding#602663
ffmpeg.exe -i input_video.mp4 -i replacement_audio.m4a -vcodec copy -acodec copy -map 0:0 -map 1:0 output.mp4 https://superuser.com/questions/602662/how-do-i-replace-the-audio-in-an-mp4-file-without-re-encoding#602663
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