Same problem persisted into 22.04. Case opened with VLC developers:
https://code.videolan.org/videolan/vlc/-/issues/26919
** Bug watch added: code.videolan.org/videolan/vlc/-/issues #26919
https://code.videolan.org/videolan/vlc/-/issues/26919
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: vlc (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1953711
Title:
avcod