Software MansionSM
Software Mansion•2y ago
Al

WebRTC stream not working

I've hit an issue trying to get an MPEGTS stream displaying in the browser via WebRTC.

All seems to work, I can add the WebRTC endpoint for the stream, to the RTC Engine, the web client successfully connects, negotiates tracks, handles the offer and sdpanswer etc and I can add the transceiver for the stream to the RTCPeerConnection and get the MediaStream. When I add the MediaStream to the video element srcObject I get a blank screen with a spinner and see a continuous stream of Didn't receive keyframe for variant: messages on the server side:
[debug] Responding to STUN request [UDP, session q02, anonymous, client 100.120.41.48:50473]
[debug] No callback function specified for 'stun_query' hook [UDP, session q02, anonymous, client 100.120.41.48:50473]
[debug] <0.2875.0>/{:endpoint, "6adebe85-148e-4fc7-b06d-3246d0b345bd"}/:endpoint_bin/:ice Sending Binding Indication with params: [magic: 554869826, transaction_id: 27660277917344572907996316102]
[debug] <0.2875.0>/{:endpoint, "6adebe85-148e-4fc7-b06d-3246d0b345bd"}/:endpoint_bin/:ice Received Binding Request with params: [priority: 1853825279, magic: 554869826, trid: 27653466564182733022482168431, username: "JBcs:+aQz", use_candidate: true, ice_controlled: false, ice_controlling: true]
[debug] <0.2875.0>/{:endpoint, "6adebe85-148e-4fc7-b06d-3246d0b345bd"}/:endpoint_bin/:ice Sending Binding Success with params: [magic: 554869826, transaction_id: 27653466564182733022482168431, username: "JBcs:+aQz"]
[debug] <0.2875.0>/{:endpoint, "ed395134-d9c5-4f8e-b4a5-5274c0319487"}/{:track_sender, "07DB486FABD21734"} Didn't receive keyframe for variant: high in 500. Retrying.
...

Any clues as to what I'm missing would be greatly received.

For context, I followed the RTC Engine file example and have a main pipeline taking the video output from the MPEGTS demuxer and delivering it to a WebRTC endpoint bin.
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