They're in close proximity - for a live sport event. So all on the same network.
Thanks, I'll take a look into some of your suggestions! On Mon, Apr 28, 2014 at 2:00 PM, Jeff Shanab <jsha...@jfs-tech.com> wrote: > That is a reasonable resolution so you should not have multi-slice > keyframes. Stick to main or baseline, High would probably be 2 pass with B > frames. > H264 is of course comprised of Key frames and difference frames. But the > decoder should pump out one frame per iteration at one frame delay. > > Synchronizing multiple sources is an interesting issue. You will have to > buck the tradition of ignoring the absolute time and using the timestamps > only as a relative indicator. Instead sync the clocks on the Pi's and then > rely on this time???. Probably pick one Pi as a time server and the other > two use that to keep the clocks synced. Then control the two encoders > relative to this clock so you even start the Keyframe generation in sync. > > Perhaps the master Pi could run live555 and create a single Transport > stream with multiple video streams from the other Pi's. The transport > stream is defined as a container for streams sharing the same clock base. > > Is this to sync multiple cameras in close proximity? or distant? > > > On Mon, Apr 28, 2014 at 7:23 AM, Mark Theunissen < > mark.theunis...@gmail.com> wrote: > >> > What is the resolution / profile? >> >> I'm at 854x480. I've tried baseline, high and main. Same result. >> >> I'm using UDP. >> >> Encoded in hardware on the Pi's Broadcom chip. >> >> > Whoa? did I hear you correctly? stdin? I cannot even speculate how you >> can >> > quantify stdin timing. (try sockets, shared memory) >> >> So should I try using perhaps v4l2 driver (/dev/video0) instead of piping >> from one program to live555's stdin? >> >> > Make sure you create your timestamps at end of image capture/beginning >> of >> > encoding time. Since you are the source, the timestamps can be based all >> > off the same clock. >> >> I am the source, but it's 3 different computers (raspberry pis) - not >> sure how to sync in that case? >> >> Thanks for your replies and help. >> >> - Mark >> > >
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