Quote:
Originally Posted by Dark Shikari
Why is it more efficient despite the hordes of unnecessary LSBs to code?
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There don't have to be any extra LSBs. If you increase the depth by 2 bits, and increase the QP by 12, you're coding the exact same significant bits as before, just with less intermediate rounding in mc/idct/etc.
If you didn't care about speed you could take this all the way to the asymptote: make a codec in 32bit float.