err:quartz:GetClassMediaFile Media class not found looks like a line of interest in the log.
Whoops, I got my #issue-number mixed up when referencing from issue 2567. I fixed my reference in issue 2567, but I can't undo the wrong reference...
Good news: The publisher/developer videos now work, but the rest of the in-game videos do not.
Bad news: The actual game is now completely black except the HUD graphics as seen here:

Logs:
steam-696180.log
Re-tested the game and everything is working now, including the cut-scenes with audio and video. So I'm closing this issue as I'm no longer seeing any problems :tada:
Including logs for reference:
system_info.txt
steam-696180.log
I dont know if people still look at this but im having an issue where i open the game and it works fine, but when i select new game and difficulty, during the load screen after the cutscenes it just closes with no explenation.
proton 7.0-5x1 2022-12proton 7.0-2x1 2022-05
Compatibility Report
System Information
Distro: Linux Mint 19.1 Tessa (64 bit)
GPU: Vega 56
Driver/LLVM version: Mesa 19.1.0-devel/9.0.0
Kernel version: 5.0.7-050007-generic
Proton version: 4.2-3
I confirm:
Symptoms
All the cut-scene videos are skipped, game works fine otherwise. Cut-scenes videos are stored with ".ssu" extention and can be played back with VLC, MediaInfo reports they are WMV.
Included log of from MediaInfo.
media_info.txt
steam-696180.log
system_info.txt
Reproduction
Just launch start the game (log is of me doing that and getting into gameplay without any cut-scenes being played back.