SOLVED: Colourful Artifacts During Bright Flashes

[gnattu]

I have remuxed as suggested, no change.

I do not believe the issue is with the files themselves since when I play then in other players like VLC they do not have the same artifacts.

Browsers have less tolerance about file and that is normal that VLC or MPV can play a file but the browser cannot. And as you said, even direct playing cannot resolve this issue we can do very little unless force transcoding to make it compatible with browsers.

This "issue" is not about if the original file is "corrupted", it may be not, but it is encoded in a way that is not compatible with most browsers, and that is the problem