Tracking note: Marking the last comment as resolved because it should be fixed in Proton Experimental. If you're still seeing an issue with winegstreamer in Proton Experimental, then please add a new note for the Proton devs to ponder.
@kisak-valve Very nice, the error got fixed. But now every time you achieve something big (like solving a puzzle or clear an area) the HUD shows the colourful media foundation replacement.  Issue transferred from https://github.com/ValveSoftware/Proton/issues/4865. @hollowsaibot posted on 2021-05-27T20:34:09: # Compatibility Report - Name of the game with compatibility issues: BIOMUTANT -...