Thanks. It appears you have an Nvidia graphics driver installed, so that prevents hardware-accelerated video decoding via VAAPI from working. :(
It looks like mpv did work, is that correct? If so then to get Totem working please try this: sudo apt remove gstreamer1.0-vaapi:amd64 -- 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/1810022 Title: Totem does not play MOV file with x264 encoding To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/totem/+bug/1810022/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
