WebRTC stream not read remotely by OpenCV in Python

[sandman]

Question

I have a webrtc stream that was configured to stream live video from the official RPi 5 camera (V3) using the below path:

  cam1:
      runOnInit: bash -c 'rpicam-vid -t 0 --camera 0 --nopreview --codec yuv420 --width 1280 --height 720 --inline --listen -o - | ffmpeg -f rawvideo -pix_fmt yuv420p -s:v 1280x720 -i /dev/stdin -c:v libx264 -preset ultrafast -tune zerolatency -f rtsp rtsp://localhost:$RTSP_PORT/$MTX_PATH'
      runOnInitRestart: yes

I read it on a separate machine like so:
python -c 'import cv2; cv2.VideoCapture("tcp://10.11.0.8:8889/cam1/", cv2.CAP_FFMPEG)'
Which fails with the error below:

[tcp @ 0x64041733e700] Connection to tcp://10.11.0.8:8889/cam1/ failed: Connection timed out
[ WARN:[email protected]] global cap.cpp:204 open VIDEOIO(FFMPEG): backend is generally available but can't be used to capture by name

I am able to view the feed in the browser with http://10.11.0.8:8889/cam1/

[tomazbracic]

I have similar issue. Trying to consume webrtc stream, but get this errors

  File "/home/tomaz/razvoj/python_projects/computer_vision/picam/venv/lib/python3.10/site-packages/aiortc/contrib/media.py", line 305, in __init__
    self.__container = av.open(
  File "av/container/core.pyx", line 420, in av.container.core.open
  File "av/container/core.pyx", line 266, in av.container.core.Container.__cinit__
  File "av/container/core.pyx", line 286, in av.container.core.Container.err_check
  File "av/error.pyx", line 326, in av.error.err_check
av.error.InvalidDataError: [Errno 1094995529] Invalid data found when processing input: 'http://192.168.44.232:8889/cam1'

[aler9]

Instruction cv2.VideoCapture("tcp://10.11.0.8:8889/cam1/", cv2.CAP_FFMPEG) is wrong.
Right instructions and examples for reading a stream with OpenCV are in the README:
https://github.com/bluenviron/mediamtx?tab=readme-ov-file#opencv