What is this called and how can I do it
>>271059
Datamoshing
https://www.youtube.com/watch?v=tYytVzbPky8
Also see
https://en.wikipedia.org/wiki/Glitch_art
https://www.reddit.com/r/brokengifs/top/?sort=top&t=all
>>271059
http://www.uglitch.com/
YouGlitch - software allows you to glitch gifs (this is a different style of corruption from OP)