I'm pretty sure mp4, mkv, av1 and other video files can't be virus because of the way they don't execute anything so you should be safe downloading video content from anywhere. Only thing about yify is Ò€¦ Hopefully i donÒ€ℒt sound too much like a lost puppy dog, but i was poking around the subreddit and i see a lot of people mention that yts/yify releases are crap and you should really try to avoid them Ò€¦