[Live-devel] Not receiving frames from H264 stream

[Kerry Loux]

I should have finished working through the advice in the FAQ - openRTSP
successfully streamed from my cameras with the -t option, and setting the
fourth argument of setupSubsession() to true fixed my problems.

I also found that I did not need to specify the video resolution in order
to get a proper stream, so I would still be interested in a response to my
second question.

I apologize for not trying the advice in the FAQ before posting :-)

Thanks,

Kerry


On Thu, Apr 4, 2013 at 10:25 AM, Kerry Loux <louxkr at gmail.com> wrote:

> Hello,
>
> I'm just getting started with Live555, and have a couple questions that I
> haven't been able to resolve by searching.
>
> I have successfully compiled a test application that can connect and
> stream from this url:
> rtsp://184.72.239.149/vod/mp4:BigBuckBunny_175k.mov
>
> I'm using an H264VideoFileSink object and it works just fine.
>
> If I instead use the url for a local IP camera, I find that
> H264VideoFileSink::afterGettingFrame() is not called (and thus my file has
> zero size).
>
> I can stream this url using VLC without any problems (VLC describes the
> stream as H264 - MPEG AVC (part 10) (h264)).  The SDP string for my camera
> is below:
>
> v=0
> o=- 2251938208 2251938208 IN IP4 0.0.0.0
> s=RTSP Session of ZheJiang Dahua Technology CO.,LTD.
> t=0 0
> a=control:*
> a=range:npt=now-
> a=packetization-supported:DH
> m=video 0 RTP/AVP 96
> a=control:trackID=0
> a=framerate:30.000000
> a=rtpmap:96 H264/90000
> a=fmtp:96
> packetization-mode=1;profile-level-id=4D001F;sprop-parameter-sets=Z00AH9oBQBbpUgAAAwACAADAHjAgAB8/4AAIyf973wvCIRq,aM48gA==
> m=audio 0 RTP/AVP 8
> a=control:trackID=1
> a=rtpmap:8 PCMA/8000
>
> By looking at the SDP string for the working stream, I found that the SDP
> from my camera lacks these lines under m=video...: (I modified these to
> match the size of the image provided by my camera)
> a=cliprect:0,0,1280,720
> a=framesize:96 720-1280
>
> I read in the FAQ for openRTSP that the video dimensions are important, so
> I tried inserting these into the SDP prior to calling
> MediaSession::createNew, and of course it didn't work (this causes my
> application to crash - I knew it was a shot in the dark).
>
> So now my questions:
> 1. Any thoughts on why afterGettingFrame() isn't being called?
> 2. Do I need to worry about the height and width parameters?  I'm guessing
> they're included in maybe the sprop-parameter string, and this doesn't
> apply to H264 streams (or at least this stream) since VLC doesn't need to
> ask me for the resolution.
>
> Thanks,
>
> Kerry
>
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