[–] Poot_McGarvey [S] ago
They were converted from a gif into an mp4 video format at some other point.
Not only there is no evidence of such a conversion taking place, it's very unlikely anyone would upload a .gif in the first place. Gif simply isn't used on the web very often anymore ever since the introduction of html5 video. If the "gif" originally appeared on Twitter, it's far more likely that the clip was simply cut from the original video source and uploaded, then Twitter's servers compressed it to their specs. There is no reason or incentive for the uploader to convert to the gif format at any time.
[–] derram ago
https://www.invidio.us/watch?v=hpCJNbYokE0 :
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