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I'm trying to use PyAV to output video to a V4l2 loopback device (/dev/video1), but I can't figure out how to do it. It uses the avformat_write_header() from libav* (ffmpeg bindings).

I've been able to get ffmpeg to output to the v4l2 device from the CLI but not from python.

Yousif
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1 Answers1

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Found the solution. The way to do this is:

  1. Set the container format to v4l2
  2. Set the stream format as "rawvideo"
  3. Set the framerate (if it's a live stream, set the framerate to 1 fps higher than the stream is so that you don't get an error)
  4. Set pixel format to either RGB24 or YUV420
Yousif
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