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Originally Posted by foxyshadis
You can max out the refs at 1080p.
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Well, you should always stay within your profile @ level limit. And for broadest compatibility, I always recommend using main tier and the lowest profile and level that work for your bit depth, fps, and frame size. For normal delivery encoding at reasonably quality-tuned settings, using anything beyond that very rarely results in a material improvement in perceptual quality or reduction in file size.
Quote:
At 4K, you only get 6, and that has to include the B frames, so if you have --b-pyramid you only get --ref 4.
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This is more of syntactical thing; the actual max number of previously decoded frames that can be referenced is the same.