4k streaming to webrtc

[kaladin]

Hey everyone!

I'm developing an app that's supposed to stream a video coming from a
pipeline to several browser clients. This works perfectly fine for 720p and
1080p but when upgrading to 4k I start to see some freezing in the video
played by clients. 

The host for this project is an Nvidia TX2 and profiling the main program
doesn't seem to show any bottlenecks (gpu, cpu and memory usage are all low
and watching the stream before launching doesn't look nearly as bad as at
clients), so the bottleneck seems to be somewhere in webrtc. The pipeline
used by webrtc is the following in case it helps:

udpsrc multicast-group=224.1.1.1 auto-multicast=true port=5000 ! queue
max-size-bytes=0 !
application/x-rtp,media=video,clock-rate=90000,encoding-name=VP8,payload=96,
framerate=25/1 ! webrtcbin name=sendrecv latency=0

I've tried to find the reason using Firefox about:webrtc tool (We haven't
managed to make webrtc work with chrome yet) and FPS, packet loss and
bitrate all seem normal: Source is 25fps +-4Mbps and we receive  22 FPS and
+-4Mbps (on average). However, sometimes fps drop a lot and quality overall
seems to be lower than before streaming. Client pc has higher cpu and gpu
consumption thatn the jetson host but it's only around 80% for both. 

Is there any way I could debug further to find performance or something that
could help improving webrtc  performance? 

Thank you for your attention!



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