<html><head></head><body><div>Hi,</div><div><br></div><div>On Fri, 2021-04-09 at 19:22 +0200, Peter Biro wrote:</div><blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid;padding-left:1ex"><div>Hi all,<br></div><div><br></div><div>I found a pretty strange issue webrtcbin generates the following initial SDP offer with a negative clock rate:<br></div><div><br></div><div>v=0<br></div><div>o=- 5716970113760455593 0 IN IP4 0.0.0.0<br></div><div>s=-<br></div><div>t=0 0<br></div><div>a=ice-options:trickle<br></div><div>a=msid-semantic:WMS webrtc_sink<br></div><div>m=video 9 UDP/TLS/RTP/SAVPF 96<br></div><div>c=IN IP4 0.0.0.0<br></div><div>a=setup:actpass<br></div><div>a=ice-ufrag:0ybqQZNeS9CznnGxJxW/BpKyapc+CXsL<br></div><div>a=ice-pwd:ffvVDjwSJ7/+AAdh3MjUMMhz91xwZZGI<br></div><div>a=sendrecv<br></div><div>a=rtcp-mux<br></div><div>a=rtcp-rsize<br></div><div>a=rtpmap:96 H264/-1784864736<br></div><div>a=rtcp-fb:96 nack pli<br></div><div>a=mid:video0<br></div><div>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<br></div><div><br></div><div>Actually it is more like a random number it changes in every session setup. However as I see it should be set to 9000.<br></div><div><br></div><div>My pipleine is pretty simple:<br></div><div><br></div><div>nvarguscamerasrc sensor-id=0 sensor-mode=0 gainrange="1 16" ispdigitalgainrange="1 1"<br></div><div> ! video/x-raw(memory:NVMM), width=(int)1920, height=(int)1080, format=(string)NV12, framerate=(fraction)30/1<br></div><div> ! nvvidconv ! nvv4l2h264enc bitrate=8000000 control-rate=1 insert-sps-pps=true ! rtph264pay mtu=1400 <br></div><div> ! webrtcbin name=webrtc_sink latency=0<br></div><div><br></div><div>And on the application side Im handling the singling. <br></div><div><br></div><div>Do you have any idea how to fix this? What I am missing here?<br></div></blockquote><div><br></div><div>This is definitely a bug in webrtcbin, it shouldn't be generating an SDP with an invalid clock rate.</div><div><br></div><div>Can you run it with "gst-launch-1.0 -v" to see wahtr caps the payloaders set on webrtcbin ?</div><div><br></div><div>Do you set any codec preferences on webrtcbin ?</div><div><br></div><div>Olivier</div><div><br></div><blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid;padding-left:1ex"><div><br></div><div>Thanks,<br></div><div>Peter<br></div><div><br></div><div><br></div><div>_______________________________________________<br></div><div>gstreamer-devel mailing list<br></div><div><a href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a><br></div><div><a href="https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel">https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a><br></div></blockquote><div><br></div><div><span><pre>-- <br></pre><div data-evo-paragraph="" class="">Olivier Crête</div><div data-evo-paragraph="" class=""><a href="mailto:olivier.crete@collabora.com">olivier.crete@collabora.com</a></div><div data-evo-paragraph="" class=""><br></div></span></div></body></html>