The real question is.
Is this you? 
Just kidding.. I have the same issue too..
Maybe not going too deep on the squat would help.
hell yeah its me... im tiny as shit. probably lost over 70 lbs since i started posting.
the weird thing is, it seems like no matter how shallow i squat, it still happens! normally it will happen just above parallel (like in the video) but if i decide to half squat, it will just happen sooner!
also thanks for the video, but the reason i made this thread is because i've found advice like this unhelpful. he doesn't say how long, how often, etc. to do the stretches. but that's sort of beside the point: whenever i stretch, it doesn't really seem to do much besides hurt my joints. once i read up on PNF (through pavel's
relax into stretch) i thought i had just been stretching too aggressively, but it seems like any stretch at all requires me to put significant strain on my joints. i don't really feel particularly tight or anything either. you'd think that, if tight muscles were the cause, then i would feel a stretch at the bottom of the squat, but i don't.
i'm just skeptical that this problem can be solved through stretching.