Greetings all, I'm a pretty low-level ffmpeg user, just doing screen captures, compressions, and some simple format conversions. I have not made much progress understanding more advanced key concepts; I apologize if this is a basic question.
I have a four-input video capture card, (Blackmagic DeckLink) and I successfully built ffmpeg with support for that. I can capture using the card, and I can run two captures concurrently as independent processes putting output into two different files. I haven't tried running all four at once (though that's my long-term goal, along with another four audio channels from a USB capture device). However, I would like to be able to put the multiple streams into a single file. There are a couple of reasons for this, and if my expectations are misplaced, now's a great time to tell me. One is that I'd like the timecodes to be synchronized, another is that I'd prefer a single command to start everything, and end everything, at the same instant. This, I hope will reduce the complexity of synchronizing the channels in later editing. But I have no clue how to start with this. I tried simply adding more input channels to my input specifications: ffmpeg -f decklink -i 'DeckLink Quad HDMI Recorder (1)' -f decklink -i 'DeckLink Quad HDMI Recorder (4)' -c:v copy -c:a copy -metadata title=DeckLinkCapture capture.mov But all I got was a ton of buffer overruns, and a file that ffprobe said only contained one video stream. I believe that .mov can hold multiple streams, but I have not particular reason for using that file format, other than I often use it when I go with a prores compression. (I'm hoping that later in this project I might get enough CPU power to go that route, and reduce bandwidth and storage requirements to less insane levels) Can someone point me at a template for a command line that might do what I need? If the explanation or resources might help me understand the concepts better, that would be a bonus (and might result in my becoming a little more self-sufficient!) Cheers, Simon -- Simon Roberts (303) 249 3613 _______________________________________________ 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".