title: WebRTC H264 connection - strange profile-level-id
body: <p>I'm trying to establish WebRTC connection between an RTSP camera and a browser.
  The cam creates a nice h264 stream which plays well in VLC player.
  For WebRTC I'm using <a href="https://janus.conf.meetecho.com/" rel="nofollow noreferrer">Janus</a>.</p>
  
  <p>The camera stream is not playing in either Chrome, either FF, because it offers a strange profile-level-id: ffffc028.</p>
  
  <p>If I force Janus to offer a well-known profile-level-id (which is obviously a hack!), Chrome could play the stream but FF crashes immediately after the first keyframe reception.</p>
  
  <p>Camera stream is created by <a href="https://github.com/mpromonet/v4l2rtspserver" rel="nofollow noreferrer">v4l2rtspserver</a>.</p>
  
  <h2>Please help me to identify where this profile-level-id.</h2>
  
  <p>Is it valid at all?</p>