Using libmpv to play multiple RTSP streams leads to RTP lost

Important Information

Provide following Information:

• mpv version: 0.33
• Windows Version: Windows 7 & Windows 10(20H2 19042.985)
• Source of the mpv binary: ea89e81
• If known which version of mpv introduced the problem
• Possible screenshot or video of visual glitches
  

Reproduction steps

A libmpv based Qt program, if required, I can write a sample.
the properties set are:

1. hwdec = no;
2. rtsp-transport = udp, same if tcp;
3. profile = low-latency & untimed = 1, same if without;
4. osc = 0
5. input-default-bindings = no
6. input-vo-keyboard = no

Expected behavior

Actual behavior

[ffmpeg/demuxer] warn: rtsp: max delay reached. need to consume packet
[ffmpeg/demuxer] warn: rtsp: RTP: missed 2 packets

The CPU/GPU is enough to play with 9 mpv instances without problem.

And there is no report about rtp lost by the wireshark.

Log file

log files of each mpv_handle, the first log contains more contents.

output-0.log
output-1.log
output-2.log
output-3.log
output-4.log
output-5.log
output-6.log
output-7.log
output-8.log

The issue will be closed for ignoring the issue template.

Sample files

Start by reviewing output-0.log through output-8.log and the reported libmpv settings, then reproduce the nine-stream Qt/libmpv setup with both UDP and TCP RTSP transport. Compare the RTSP/RTP warnings with Wireshark, and treat the investigation as complete only when the cause of the reported missed packets is identified and a verified result is documented.