mkv is a better output format to use On 24/06/2020, Simon Roberts <si...@dancingcloudservices.com> wrote: > 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". _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user
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