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For clarity,
The video described by the Wine bug report is playable via gstreamer:
gst-launch-1.0 playbin3 uri=file:///home/any/Downloads/MainMenu_BG_Generico_PROXY.m4v
The video even plays via DX11 video render method that mimics a simple game video streamer not involving Media Foundation.
For the types of games attempting to play videos via Media Foundation, neither codecs nor gstreamer may be at fault but rather how Wine handles Media Foundation calls and maps them to gstreamer and codecs.
"The Signifier" game binary described by the Wine bug was built via Unity on Windows which may add Media Foundation calls to game binaries depending on video formats chosen when enabling the Unity video player component:
https://discussions.unity.com/t/initializing-microsoft-media-foundation-failed-when-enabling-videoplayer-component/872251 [External Link]
Media Foundation enabling via Unity video player component may be a fairly common game dev scenario meaning the collection of games may be fairly large whose videos are not playable on Linux/SteamDeck via Wine until fixed.
Once a fix is provided, a search for all Unity games that use Media Foundation is a worthy effort to test the robustness of the patches. Other game engines likely offer/offered similar Media Foundation video player options to which fixes to Wine's Media Foundation should also apply.