title: WebRTC - g_signal_emit_by_name to set local-description take more that 10s
body: <p>I'm facing an issue with webrtcbin that was cross compiled on my IP CAM.
  the set local description is delayed by 10s even 20 to 30s sometimes.</p>
  <p>I found that the difference between running webrtcbin on my VM and my CAM is mainly when invoking g_signal_emit_by_name.</p>
  <p>what is the right way to debug the g_signal_emit_by_name and make this operation near-real time.</p>