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Proton could integrate VLC to play videos without codecs
VLC and all those other platforms still require codecs to any play video.

Codecs aren't necessarily the problem at all.

Media Foundation may construct a playback topology involving otherwise working codecs which isn't compatible with vanilla wine.

GE-proton adds an extra layer of compatibility atop vanilla wine including patches still pending release from wine-staging which have not been merged into vanilla wine yet. GE-proton may also include additional libraries and configurations to vanilla wine which often solves video playback bugs.

To reproduce testcard screenshot posted from Proton, run:
gst-launch-1.0 videotestsrc ! ximagesink
The testcard video file is available at: https://github.com/GloriousEggroll/proton-ge-custom/releases [External Link]

1. Unzip release (such as GE-Proton10-15)
2. play ~/Downloads/GE-Proton10-15/files/share/media/blank.mkv

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