PyAV gets stuck when encountering a [mpeg2video] Invalid frame dimensions 0x0.

[Alexandre-SCHOEPP]

I have recently started to update my codebase in PyAV instead of batch-controlled FFMPEG, and encountered an issue:

I run a UDP+MPEG-TS video-only stream between two processes on my computer, and use it to transmit video between them. Unfortunately, this fails on PyAV:

My install

FFMPEG source build info

From the initialization of FFMPEG on the minimum example

ffmpeg version 7.1.1-full_build-www.gyan.dev Copyright (c) 2000-2025 the FFmpeg developers
  built with gcc 14.2.0 (Rev1, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-lcms2 --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libopenjpeg --enable-libquirc --enable-libuavs3d --enable-libxevd --enable-libzvbi --enable-libqrencode --enable-librav1e --enable-libsvtav1 --enable-libvvenc --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxeve --enable-libxvid --enable-libaom --enable-libjxl --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-liblc3 --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      59. 39.100 / 59. 39.100
  libavcodec     61. 19.101 / 61. 19.101
  libavformat    61.  7.100 / 61.  7.100
  libavdevice    61.  3.100 / 61.  3.100
  libavfilter    10.  4.100 / 10.  4.100
  libswscale      8.  3.100 /  8.  3.100
  libswresample   5.  3.100 /  5.  3.100
  libpostproc    58.  3.100 / 58.  3.100

I run on Windows 11, on Python 3.12.3, and I use PyAV 14.3.0

Minimum reproducible example

This example is on this gif file

When running the following code

import av, subprocess, time

ffmpeg_command: list[str] = [
    "ffmpeg",
    "-re",  # Wait until the next frame should occur, rather than when it's ready
    "-stream_loop", "-1",  # loop the gif file infinitely
    "-i", str(race_horse),
    "-f", "mpegts", stream_addr  # stream as rtp stream
]
stream_src = subprocess.Popen(ffmpeg_command)
time.sleep(0.1)

with av.open(
    addr, 'r', timeout=10., metadata_errors="ignore", container_options={"video_size": "184x135"}
) as video:
    for packet in video.demux():
        ...

PyAV returns the error message [mpeg2video] Invalid frame dimensions 0x0, which is fine: ffmplay raises the same error (and does so a couple of times), but, while ffmplay gets unstuck in less than 3 seconds, PyAV get stuck seemingly permanently (I have yet to have the ... code executed

Would you know how I could get the stream to work ?