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High Quality and High Definition basically go hand in hand.
while it's true that High Def = "high quality", the term "high quality" on it's own is somewhat subjective. Having said that, to regard any footage seen on youtube as "high quality" means you're standards are pretty low.
I meant for viewing. And you don't have to be a jackass. >_> Visit gametrailers. They've got plenty of content you can view/stream in HD.