[Live-devel] Streaming from a live source (camera) using H264VideoStreamFramer

[Micha Kalfon]

Thanks. I can confirm this was indeed fixed in 2020.02.23.

On Mon, Feb 24, 2020 at 12:07 AM Ross Finlayson <finlayson at live555.com>
wrote:

> 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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> live-devel mailing list
> live-devel at lists.live555.com
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>


-- 

Micha Kalfon
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