Mint 21.1 by default installs LibreOffice with libreoffice-gtk3 1:7.3.7-0ubuntu0.22 As long as this package is present, Impress displays mpeg4 and avi videos in left-justified monochrome, even though the default Celluloid viewer and VLC display them perfectly. An avoidable bug, since removing the integration package changes the UI’s appearance as expected but mpeg4 and avi videos play in the presentation perfectly.
If you want to turn this avoidable bug into a fixed bug eventually, please don’t forget to file it.
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