RTSP timestamp synchronization

[lex_grant]

Hi!
I have a task to get the exact time of the event shot on the IP camera, up
to 1 millisecond. Camera is shooting a special screen that shows date and
time with accuracy up to 1 microsecond. Also camera has a direct connection
to server via network cable. My pipeline is look like that:  rtspsrc ! 
rtph264depay ! h264parse ! avdec_h264 ! appsink. Currently I'm getting
frames through gst_app_sink_pull_sample() method call-backed by "new-sample"
signal generated by appsink. The system time is syncing by a special
hardware.

Is there any way to get a correct event timestamp for every received frame? 

Recently I've read about wonderful GstPtpClock feature. This feature allows
to synchronize RTSP streams received from remote devices. Can I use it to
get the correct time of the event?

Thanks!



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