Note that this change requires thetextoverlay element which is part of thepango plugin. Since this MKV is generated at build-time this doesn't change the runtime requirements of Proton, but it does require that the gstreamer that you use on your build machines ship thatpango gstreamer plugin. I noticed that this build-env gstreamer is already different from the gstreamer you ship with Proton since it ships with an av1 encoder, and Proton does not.

Note that thepango plugin is shipped by default on all Linux distros, so it should be easy to gain access to.

Could you overlay it on the test pattern? That may be the best of both worlds.

Done. I also made the pattern move and made it loop perfectly. I figured that you might've wanted movement to clarify that the game is not frozen. The change was:

- num-buffers=120 pattern=black+ num-buffers=160 horizontal-speed=2

Just a gentle poke about this, since I saw today that another person reported this on /r/linux_gaming:https://www.reddit.com/r/linux_gaming/comments/1mn9ql3/what_in_the_world_is_this/