How do I fix videos constantly glitching whether viewing online or offline?

[Pragmat1c]

Any videos I try to play, online (such as from YouTube) or offline (such as mp4 or any video files) don't load, they just flicker between the actual frames of the video and a dark green screen. This issue has persisted for at least a month without it being solved by a troubleshooter or restarting.

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