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Large packet loss when estimated bandwidth is close to the lowest SVC layer

Open vpalmisano opened this issue 2 years ago • 2 comments

Bug Report

When the estimated bandwidth is close to the lowest SVC layer, the allocated layer fluctuates between 0:0 and -1:-1. Concurrently, we observed large packet loss spikes at receiver side (80-100%) that didn't happen when using VP8/Simulcast in the same conditions. Analyzing the captured RTP packets, there are large seqno jumps that could explain the packet loss:

nopatch nopatch.pcapng.gz

The issue can be reproduced consuming 1 VP9 stream and calling transport.setMaxOutgoingBitrate(80000) (set a number close to the lowest encoded SVC layer).

vpalmisano avatar Apr 21 '23 19:04 vpalmisano

I plan to check this issue in the next days.

jmillan avatar May 10 '23 14:05 jmillan

It's been very complicate taking the time to check this lately. I can't say when I'm going to be able to check this.

Meson option ms_rtc_logger_rtp will print a log line for each RTP packet sent or dropped by mediasoup indicating the cause in case of drop, which would be a good way to troubleshot this. In case anyone is willing to dig further.

cd worker && MESON_ARGS="-Dms_rtc_logger_rtp=true" make

jmillan avatar May 16 '23 09:05 jmillan