With the correct video codecs installed (for the particular test video I was using, I needed gstreamer1.0-plugins-bad which pulls in libav), this now works on the mantic final images, under both the Pi 4 and 5.
** Changed in: totem (Ubuntu) Status: Confirmed => Fix Released -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to totem in Ubuntu. https://bugs.launchpad.net/bugs/1998782 Title: Totem unable to play video on Raspberry Pi: "could not initialize OpenGL support" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/totem/+bug/1998782/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs