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That my friend, depends on what profile and what Level they've used. For example, AVC Level 2.1 can even be played on a PSP, while 2.2 and above cannot.
Then it could also depend on, if there using VRF (Variable Frame Rate) or oldschool CFR (Constant Frame Rate). H264/AVC is meant to use VRF. But we still defile that.. I wonder why...
Sure writing the avs might not be as easy as with cfr. It could also depend on what player your using.
It's hard to figure out what there using, as I hardly ever watch fansubs myself.
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