WebRTC generate invalid rtpmap for H264

[Olivier Crête]

Hi,

Oh right, you're using webrtcbin.. Erm, you can enable the webrtcbin
debug category and it should print the caps that it gets.

Olivier

On Fri, 2021-04-09 at 20:02 +0200, Peter Biro wrote:
> Hi,
> 
> Im not sure if if can run it from terminal (I dont know how to do the
> signalling that way) but I can setup debug logging if it that ok?
> 
> I dont set any codec preferences on the webrtc.
> 
> Strange thing this is only appears if I use H264, I just tried to run
> the very same pipeline with VP8 codec the SDP looks alright (but
> unfortunately I have to use H264 so this wont be a workaround for my
> use case):
> 
> v=0
> o=- 711117265011778833 0 IN IP4 0.0.0.0
> s=-
> t=0 0
> a=ice-options:trickle
> a=msid-semantic:WMS webrtc_sink
> m=video 9 UDP/TLS/RTP/SAVPF 96
> c=IN IP4 0.0.0.0
> a=setup:actpass
> a=ice-ufrag:Qfsq+80LvU2YdnPZzVjuA4/UrODXoKrN
> a=ice-pwd:HWOOU8kI1droNmky2tjnGekC1NquWNmH
> a=sendrecv
> a=rtcp-mux
> a=rtcp-rsize
> a=rtpmap:96 VP8/90000
> a=rtcp-fb:96 nack pli
> a=ssrc:2035319666 msid:user1666440897 at host-b40b4b48
> webrtctransceiver0
> a=ssrc:2035319666 cname:user1666440897 at host-b40b4b48
> a=mid:video0
> a=fingerprint:sha-256
> C2:C3:5D:14:8F:06:44:8A:0E:A8:76:4B:D8:46:5D:BF:31:73:F1:CB:32:F7:8B:
> F8:F5:D1:D9:58:1D:3C:5D:05
> 
> Thanks,
> Peter
> 
> > On 2021. Apr 9., at 19:52, Olivier Crête
> > <olivier.crete at collabora.com> wrote:
> > 
> > Hi,
> > 
> > On Fri, 2021-04-09 at 19:22 +0200, Peter Biro wrote:
> > > Hi all,
> > > 
> > > I found a pretty strange issue webrtcbin generates the following
> > > initial SDP offer with a negative clock rate:
> > > 
> > > v=0
> > > o=- 5716970113760455593 0 IN IP4 0.0.0.0
> > > s=-
> > > t=0 0
> > > a=ice-options:trickle
> > > a=msid-semantic:WMS webrtc_sink
> > > m=video 9 UDP/TLS/RTP/SAVPF 96
> > > c=IN IP4 0.0.0.0
> > > a=setup:actpass
> > > a=ice-ufrag:0ybqQZNeS9CznnGxJxW/BpKyapc+CXsL
> > > a=ice-pwd:ffvVDjwSJ7/+AAdh3MjUMMhz91xwZZGI
> > > a=sendrecv
> > > a=rtcp-mux
> > > a=rtcp-rsize
> > > a=rtpmap:96 H264/-1784864736
> > > a=rtcp-fb:96 nack pli
> > > a=mid:video0
> > > a=fingerprint:sha-256
> > > 9B:11:48:BE:41:FF:CA:FE:62:B1:98:07:7B:E6:80:2A:56:9A:56:DC:A2:60
> > > :81:27:DE:EC:F5:76:C1:C4:39:51
> > > 
> > > Actually it is more like a random number it changes in every
> > > session setup. However as I see it should be set to 9000.
> > > 
> > > My pipleine is pretty simple:
> > > 
> > > nvarguscamerasrc sensor-id=0 sensor-mode=0 gainrange="1 16"
> > > ispdigitalgainrange="1 1"
> > >     ! video/x-raw(memory:NVMM), width=(int)1920,
> > > height=(int)1080, format=(string)NV12, framerate=(fraction)30/1
> > >     ! nvvidconv ! nvv4l2h264enc bitrate=8000000 control-rate=1
> > > insert-sps-pps=true ! rtph264pay mtu=1400 
> > >     ! webrtcbin name=webrtc_sink latency=0
> > > 
> > > And on the application side Im handling the singling. 
> > > 
> > > Do you have any idea how to fix this? What I am missing here?
> > 
> > 
> > This is definitely a bug in webrtcbin, it shouldn't be generating
> > an SDP with an invalid clock rate.
> > 
> > Can you run it with "gst-launch-1.0 -v" to see wahtr caps the
> > payloaders set on webrtcbin ?
> > 
> > Do you set any codec preferences on webrtcbin ?
> > 
> > Olivier
> > 
> > > 
> > > Thanks,
> > > Peter
> > > 
> > > 
> > > _______________________________________________
> > > gstreamer-devel mailing list
> > > gstreamer-devel at lists.freedesktop.org
> > > https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
> > 
> > 
> > -- 
> > Olivier Crête
> > olivier.crete at collabora.com
> > 
> > _______________________________________________
> > gstreamer-devel mailing list
> > gstreamer-devel at lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
> 
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

-- 
Olivier Crête
olivier.crete at collabora.com

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/gstreamer-devel/attachments/20210409/ad504b51/attachment.htm>