Thanks for the note.  There are a lot of things going on here:

1/ First, note that developers (using the LIVE555 libraries) never need to 
concern themselves with RTP timestamps; these are only used internally, by the 
RTP/RTCP protocol.  Our library code automatically converts between 
presentation times and RTP timestamps.  So, in the future, when describing 
possible problems, please reference only presentation times.

2/ “H264VideoStreamFramer” ignores the presentation times of all data that's 
fed to it.  That's because the input to "H264VideoStreamFramer" (unlike 
"H264VideoStreamDiscreteFramer") is treated as a continuous byte stream, not a 
sequence of discrete NAL units.  Instead, "H264VideoStreamFramer" generates its 
own presentation times (aligned to ‘wall clock’ time).

3/ HOWEVER, your issue revealed a bug in our server’s implementation of the 
RTSP “PAUSE” command - especially for "H264VideoStreamFramer”.  It was not 
properly updating the presentation times when resuming after a pause.

I have released a new version (2020.02.23) of the “LIVE555 Streaming Media” 
code that should fix this problem.  Thanks again for reporting this.

4/  Note that - for our RTSP server implementation - the presentation times of 
input data MUST be aligned with 'wall clock’ time - i.e., the times that you’d 
get by calling “gettimeofday()".  Therefore, your “CameraDeviceSource” would be 
incorrect, even if they were used by “H264VideoStreamFramer” (which they're 
not).


Ross Finlayson
Live Networks, Inc.
http://www.live555.com/


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