Those are, as you noted, audio-less WEBM files, not MP4s (though it may have automatically transcoded a video into that format). It’s essentially a more-efficient form of animated GIF, not really a video in the sense that non-technical end-users likely think of it.
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and another example that
it also does sound just fine, there was no sound actually, weird So no sound of any kind on lemmy ?Those are, as you noted, audio-less WEBM files, not MP4s (though it may have automatically transcoded a video into that format). It’s essentially a more-efficient form of animated GIF, not really a video in the sense that non-technical end-users likely think of it.