Guilty Gear X2 #Reload (314030)

[Elmapul]

Compatibility Report

• Name of the game with compatibility issues:
  name: Guilty Gear X2 #Reload
  app id: 314030

System Information

CPU: Intel(R) Core(TM) i5-3317U CPU @ 1.70GHz
GPU: Intel(R) Core(TM) i5-3317U CPU @ 1.70GHz
Driver: Intel Open Source Technology Center Mesa DRI Intel(R) Ivybridge Mobile x86/MMX/SSE2
driver version: 3.0 Mesa 19.2.8

Ubuntu 18.04

• Kernel version: 4.15.0-101-generic

• Link to full system information:
  https://gist.github.com/Elmapul/c051a0793d58ceaeb78708b1188558c3

• Proton version:
  4.2.9 and 5.0.9:

I confirm:

• [ x] that I haven't found an existing compatibility report for this game.
• [ x] that I have checked whether there are updates for my system available.

i will embed both files, proton 4 refers to proton 4.2-9.
the other file reffer to proton 5.0-9.

https://github.com/Elmapul/proton-debug

Symptoms:
on proton 4.2-9:
the intro is automatically skiiped, the game start directly at the main screen, the game is playable but any video it might have does not play.
some buttons are mapped wrong (start goes to L3, R3) but i'm using an generic xbox controler so that might be the issue.

*the game crash if you try to minimize it. (the screen goes black)

on proton 5.0-9:
the game isnt playable, the first intro video is skiped, then there is an second presentation showing the characters fighting each other, but instead of showing the characters there are some gigantic pixel blocks (the same goes for the background), you can try to skip this intro, but then the game mainscreen is all black, without any sounds, the game is unplayable at this proton version.

Reproduction:
just opening the game.

[kisak-valve]

From the 5.0-9 log:

603832.548:00c0:0104:err:gstreamer:unknown_type Could not find a filter for caps: "video/mpeg, systemstream=(boolean)true, mpegversion=(int)1"
603832.548:00c0:00c4:err:gstreamer:gstdecoder_init_gst Failed to play stream.
603832.549:00c0:0100:err:gstreamer:watch_bus decodebin0: Your GStreamer installation is missing a plug-in.
603832.549:00c0:0100:err:gstreamer:watch_bus ../../proton/gst-plugins-base/gst/playback/gstdecodebin2.c(4679): gst_decode_bin_expose (): /GstBin:bin0/GstDecodeBin:decodebin0:
no suitable plugins found:
Missing decoder: MPEG-1 System Stream (video/mpeg, systemstream=(boolean)true, mpegversion=(int)1)