Thank you Carl and DEF! Works perfectly! I’m using out.mp4 just for syntax testing. In the actual application I’ll be outputting to:
-f flv "rtmp://a.rtmp.youtube.com/live2/my-youtube-streaming-key” But it’s good to know about container issues! > On Feb 19, 2021, at 7:14 PM, Carl Zwanzig <c...@tuunq.com> wrote: > > 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! > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
