Any video playback does not work on Linux, especially mp4 Ue 5.4.4

Any video playback does not work on Linux, especially mp4 Ue 5.4.4
connected all possible codecs in plugins, video does not work. Only WebM, and it terribly slows down and does not allow to run more than one video at a time.

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I have also experienced this problem. Is there some info about what settings are required for WebM to work? Does it only work with VP8 (for example), at certain bit-rates or other settings?