[Live-devel] waiting for SPS/PPS

[Matthew Czarnek]

Thanks Ross, trying to get openRTSP working again to test it there.
Interestingly, using Wireshark to spy on the exchange, live555 is indeed
sending the SDP in response to DESCRIBE

Heads up, the build instructions found here don't work:
http://www.live555.com/liveMedia/#config-windows

Visual Studio 2019 doesn't have a "Open Workspace" option. Or any other way
of opening mak files that seems to do it.

Trying to build it using the CMake file I was previously using (Happy to
send it to you if you'd like to use CMake) but would be nice to have those
instructions updated.

Thanks,
Matt

On Wed, Jul 1, 2020 at 8:10 PM Ross Finlayson <finlayson at live555.com> wrote:

> You didn’t say specifically *how* you are using the “LIVE555 Streaming
> Media” code, and what you are trying to do with it - but from the context
> of your message, I assume that you are using it to develop a RTSP server.
>
>
> > It seems to be working fine but when I stream over RTSP, VLC is telling
> me that it hasn't gotten the SPS/PPS. It seems like I'm generating it ok,
> though clearly something is off. Perhaps you can tell me at what point the
> SPS & PPS are actually sent?
>
> SPS and PPS are H.264 NAL units, just like those for video frame data.
> The LIVE555 code does not generate them (to insert into an outgoing RTP
> stream); it is up to your H.264 source (i.e., encoder) to generate them.
>
> However, the presence of "sprop-parameter-sets” in your SDP means that the
> LIVE555 RTSP server code *has* seen SPS and PPS NAL units - most likely at
> the very beginning of your stream.  So it seems that your encoder generated
> SPS and PPS NAL units once, at the very start, but not thereafter.
>
> This should, however, be enough for VLC (as a RTSP client), because it
> gets the SPS and PPS from the SDP (returned by a RTSP “DESCRIBE” command)
> before it starts receiving the H.264/RTP stream.  I can’t help you with
> problems with VLC, but you should make sure that you are using the most
> up-to-date version.
>
> You could also try using “openRTSP” as a RTSP client, and rename the
> resulting video output file to have a “.h264” video suffix before playing
> it with a video player.  (“openRTSP” also gets the SPS and PPS NAL units
> from the SDP, and prepends them to the video output file.)
>
>
> Ross Finlayson
> Live Networks, Inc.
> http://www.live555.com/
>
>
> _______________________________________________
> live-devel mailing list
> live-devel at lists.live555.com
> http://lists.live555.com/mailman/listinfo/live-devel
>


-- 
Matthew Czarnek
(814) 421-6770
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