Thanks for the information. I see you were originally testing
/dev/video2, my GST_DEBUG command assumed /dev/video0, and it doesn't
look like anything actually failed with that device. Can you reattach
the GST_DEBUG command with /dev/video2?

  GST_DEBUG_NO_COLOR=1 GST_DEBUG_FILE=/tmp/gstdebug-video2.log
GST_DEBUG='v4l2*:5' gst-launch-1.0 v4l2src device="/dev/video2" !
videoconvert ! ximagesink

I'll also be curious if

  gst-launch-1.0 pipewiresrc path=/dev/video2 ! videoconvert !
autovideosink

consistently works for you.

** Changed in: gst-plugins-good1.0 (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/2071644

Title:
  sometimes takes ~5 seconds to _dma_fmt_to_dma_drm_fmts: assertion 'fmt
  != GST_VIDEO_FORMAT_UNKNOWN' failed

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