Missed packets when input multiple RTSP streams

[xiaofeng]

Summary of the bug:

When using FFmpeg to receive and decode multiple RTSP streams, FFmpeg will drop or miss packets.

It works fine if I run multiple FFmpeg instances, one RTSP stream per instance.

The hardware capabilities should be sufficient.

How to reproduce:

Windows is required

Commands to reproduce under a PowerShell terminal:

$env:rtspUrl="rtsp://any_rtsp_stream"
$env:rtspTransport="udp"

.\ffmpeg.exe                                              `
     -rtsp_transport $env:rtspTransport  -i $env:rtspUrl  `
     -rtsp_transport $env:rtspTransport  -i $env:rtspUrl  `
     -rtsp_transport $env:rtspTransport  -i $env:rtspUrl  `
     -rtsp_transport $env:rtspTransport  -i $env:rtspUrl  `
     -filter_complex "[1:v]null;[2:v]null;[3:v]null" -map 0 -f null /dev/zero
 ... output
ffmpeg version git-2021-05-17-11b489d5 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.2.1 (GCC) 20210130
  configuration: --cross-prefix=i686-w64-mingw32- --prefix=/home/backup/opensource/mpv-winbuild-cmake/build/i686/install/mingw --arch=i686 --target-os=mingw32 --target-exec=wine --pkg-config-flags=--static --enable-cross-compile --enable-runtime-cpudetect --enable-debug --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-avisynth --enable-vapoursynth --enable-gmp --enable-libass --enable-libbluray --enable-libfreetype --enable-libfribidi --enable-libmodplug --enable-libopenmpt --enable-libmp3lame --enable-libopus --enable-libsoxr --enable-libspeex --enable-libvorbis --enable-libbs2b --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libaom --enable-libdav1d --enable-libxvid --enable-libzimg --enable-libtls --enable-libxml2 --enable-libmysofa --enable-libssh --enable-libmfx --enable-cuda --enable-cuvid --enable-nvdec --enable-nvenc --enable-amf --disable-decoder=libaom_av1 --extra-cflags='-DMODPLUG_STATIC -gdwarf'
  libavutil      57.  0.100 / 57.  0.100
  libavcodec     59.  1.100 / 59.  1.100
  libavformat    59.  2.100 / 59.  2.100
  libavdevice    59.  0.100 / 59.  0.100
  libavfilter     8.  0.101 /  8.  0.101
  libswscale      6.  0.100 /  6.  0.100
  libswresample   4.  0.100 /  4.  0.100
  libpostproc    56.  0.100 / 56.  0.100
 ...
[rtsp @ 066ee840] RTP: missed 34 packets
[rtsp @ 066ee840] max delay reached. need to consume packet
[rtsp @ 066ee840] RTP: missed 68 packets
[rtsp @ 066ee840] max delay reached. need to consume packet
[rtsp @ 066ee840] RTP: missed 11 packets
[rtsp @ 066ee840] max delay reached. need to consume packet
[rtsp @ 066ee840] RTP: missed 1 packets
[rtsp @ 066ee840] max delay reached. need to consume packet
[rtsp @ 066ee840] RTP: missed 221 packets
[rtsp @ 066ee840] max delay reached. need to consume packet
[rtsp @ 066ee840] RTP: missed 2 packets
...

[Carl Eugen Hoyos]

Please provide the command line you tested together with the complete, uncut console output to make this a valid ticket.

[xiaofeng]

loglevel debug

[xiaofeng]

loglevel info

[xiaofeng]

Replying to Carl Eugen Hoyos:

Please provide the command line you tested together with the complete, uncut console output to make this a valid ticket.

Log files generated with the -report option has been attached.