On 2/19/2021 6:23 PM, Steven Kan wrote:
What’s the correct syntax to mux the video from new Cam1 with the audio
from older Cam2, while completely discarding the unwanted video from
Cam2? Preferably without transcoding anything, since I want to minimize
CPU usage.
It's all about the mapping (and this is answered at
https://stackoverflow.com/questions/12938581/ffmpeg-mux-video-and-audio-from-another-video-mapping-issue/12943003)
but the command will look something like
ffmpeg -i VIDEOSOURCE -i AUDIOSOURCE -map 0.0 -map 1.1 -t 00:00:10 out.mp4
(assume that the video is stream 0 in both and audio is stream 1)
Also look up the options -shortest and -apad to see if they may apply
(https://ffmpeg.org/documentation.html).
I'd consider whether .mkv is better output container than .mp4, which can
become corrupt if the file isn't closed properly.
Later,
z!
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