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Issue created by Administrator@rootContributor0 of 2 checklist items completed0/2 checklist items

cv2.imshow freezes after av is imported

Created by: samiamlabs

Overview

My setup is a docker container with Ubuntu 22.04 and python 3.10 and av installed through pip as a dependency of aiortc.

The python scripts freeze on the cv2.imshow line after av is imported. There is no opencv window either. If I don't import av it works.

Expected behavior

The pip installed version of av should not cause any issues for opencv.

Actual behavior

cv2.imshow does not work after av is imported

Traceback: There is no error print or traceback, and I was not able to find any info additional info through the VSCode debugger.

Investigation

I tried building/installing v10.0.0 of PyAV from the source, which fixed the issue.

Reproduction

import cv2
import numpy as np

import av

def main(args=None):
    img = np.zeros((200, 200, 3), dtype=np.uint8)
    cv2.imshow('ImageWindow', img)
    cv2.waitKey()

if __name__ == '__main__':
    main()

Versions

  • OS: {{Ubuntu 22.04}}
  • PyAV runtime:
PyAV v9.2.0
library configuration: --disable-static --enable-shared --libdir=/tmp/vendor/lib --prefix=/tmp/vendor --disable-alsa --disable-doc --disable-mediafoundation --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-lzma --enable-version3 --enable-zlib
library license: GPL version 3 or later
libavcodec     58.134.100
libavdevice    58. 13.100
libavfilter     7.110.100
libavformat    58. 76.100
libavutil      56. 70.100
libswresample   3.  9.100
libswscale      5.  9.100
  • PyAV build:
{{ Complete output of `python setup.py config --verbose`. }}

No setup.py for pip installed package?

  • FFmpeg:
bash: ffmpeg: command not found

Research

I have done the following: