can reproduce this without opencv using:
gst-launch-1.0 v4l2src device="/dev/video2" ! videoconvert ! ximagesink
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** No longer affects: opencv (Ubuntu)
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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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