Adaptive Bitrate Client Target Calculation

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Matt Lowe

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Jul 1, 2020, 4:14:22 PM7/1/20

to Ant Media Server

Hello,

I'm wondering how client target for adaptive bit-rate is calculated. I have some clients who I know have much stronger internet connections reporting targets that are quite low

I can't seem to get a WebRTC stream over 2.3Mbps to a client

Also, is it possible to set higher bit-rates for HLS streams than WebRTC streams? Would love to be able to set a lower bit-rate for WebRTC stream and a high bit-rate for HLS where it can buffer easier

2020-07-01 20:10:23,233 [vert.x-eventloop-thread-2] INFO i.a.enterprise.webrtc.WebRTCAdaptor - Client:572656515 for stream 258078917669599715913742 current video bitrate: 2000000 audio bitrate: 128000 webrtc client target bitrate: 2528000

2020-07-01 20:10:23,252 [network_thread - 5645] INFO org.webrtc.Logging - Tag:WebRtcAudioTrackExternal - Message:GetPlayoutUnderrunCount

2020-07-01 20:10:23,256 [vert.x-eventloop-thread-15] INFO i.a.enterprise.webrtc.WebRTCAdaptor - Client:1589516411 for stream 258078917669599715913742 current video bitrate: 1500000 audio bitrate: 128000 webrtc client target bitrate: 1089500

2020-07-01 20:10:23,342 [network_thread - 5540] INFO org.webrtc.Logging - Tag:WebRtcAudioTrackExternal - Message:GetPlayoutUnderrunCount

2020-07-01 20:10:23,343 [vert.x-eventloop-thread-4] INFO i.a.enterprise.webrtc.WebRTCAdaptor - Client:32252718 for stream 258078917669599715913742 current video bitrate: 2000000 audio bitrate: 128000 webrtc client target bitrate: 2520000

2020-07-01 20:10:23,352 [network_thread - 5551] INFO org.webrtc.Logging - Tag:WebRtcAudioTrackExternal - Message:GetPlayoutUnderrunCount

2020-07-01 20:10:23,355 [vert.x-eventloop-thread-3] INFO i.a.enterprise.webrtc.WebRTCAdaptor - Client:2101172705 for stream 258078917669599715913742 current video bitrate: 1500000 audio bitrate: 128000 webrtc client target bitrate: 1380000

2020-07-01 20:10:23,394 [network_thread - 5562] INFO org.webrtc.Logging - Tag:WebRtcAudioTrackExternal - Message:GetPlayoutUnderrunCount

2020-07-01 20:10:23,399 [vert.x-eventloop-thread-5] INFO i.a.enterprise.webrtc.WebRTCAdaptor - Client:1219759679 for stream 258078917669599715913742 current video bitrate: 1500000 audio bitrate: 128000 webrtc client target bitrate: 885500

2020-07-01 20:10:23,425 [EncoderQueue - 5598] INFO i.a.e.w.codec.VirtualVideoEncoder - setRateAllocation bitrate: 907000 framerate: 60 adjusted bitrate:451500 for client: 87290645

2020-07-01 20:10:24,402 [network_thread - 5576] INFO org.webrtc.Logging - Tag:WebRtcAudioTrackExternal - Message:GetPlayoutUnderrunCount

2020-07-01 20:10:24,408 [vert.x-eventloop-thread-6] INFO i.a.enterprise.webrtc.WebRTCAdaptor - Client:323461706 for stream 258078917669599715913742 current video bitrate: 2000000 audio bitrate: 128000 webrtc client target bitrate: 2540000

2020-07-01 20:10:24,900 [network_thread - 5588] INFO org.webrtc.Logging - Tag:WebRtcAudioTrackExternal - Message:GetPlayoutUnderrunCount

2020-07-01 20:10:24,900 [vert.x-eventloop-thread-7] INFO i.a.enterprise.webrtc.WebRTCAdaptor - Client:569673064 for stream 258078917669599715913742 current video bitrate: 1500000 audio bitrate: 128000 webrtc client target bitrate: 514500

Ant Media

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Jul 2, 2020, 2:52:31 AM7/2/20

to ma...@goodco.tv, ant-medi...@googlegroups.com

Hi Matt,
The calculation is made by native side of WebRTC code and it may be lower than your expectation because of the UDP protocol. If you increase bitrate from source or adaptive settings it may also increase.

Actually, HLS also creates the incoming bitrate even if you add an adaptive setting.

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Regards,

Burak Kekec

, Matt <ma...@goodco.tv> wrote:

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