"TY JPEG best" is a bit tricky. "TY" could stand for "Thanks You" or "Thank You", but in this context, it might be a typo or a short form of something else. "JPEG" refers to the image file format, so perhaps the user is referring to a video (which is sometimes compressed as a JPEG, though that's not standard). The term "best" suggests they want the highest quality version of the content.