Save RTP streams from multiple cameras with NTP timestamps

[kmliu]

I'm trying to record the video from multiple RTSP cameras at the same time. I
could have all cameras configured to sync to the same NTP server so that the
NTP time in their RTCP sender reports would be based on the same NTP clock.
But how do I save their videos to file(s) so that I can have a unified
timeline across all the video streams? For example, given a frame from one
stream and a frame from another stream, I want to be able to say this frame
is x ms before that frame.

Thanks,
Kim



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