22.04 on ARM: system video player is failing

I now see that it's a known bug: https://bugs.launchpad.net/ubuntu/+source/totem/+bug/1969512/comments/23
- = = = = = = = = = = = - - - -
I am running Ubuntu 22.04 on Raspberry Pi 400 (an ARM computer).
I can connect to an Internet TV feed, or Youtube, using Firefox, and then the broadcast runs fine.

When trying to run .MTS movies (AVCHD - 60 fps) or .mp4 movies using the system default video player, it gives the error messages:

    An error occurred.
     The specified movie cannot be found.
     Unable to create a GL context

(MTS movies can be played with the "VLC media player" application, but then they are "jumpy" - "stuttering" - the movies keep starting and stopping continuously).
(Using ffplay: it's a bit better, but the videos are still "jumpy" - "stuttering" - the movies keep starting and stopping continuously - with a higher frequency, though).

System:
    uname -a
     Linux 5.15.0-1027-raspi #29-Ubuntu SMP PREEMPT Mon Apr 3 10:12:21 UTC 2023 aarch64 GNU/Linux

    lsb_release -a
    Description: Ubuntu 22.04.2 LTS
Those movies play fine on Ubuntu 22.04 on x64.