Re:Why does the restoration of 'The Third Man' look weird?
by ars on Thursday June 25, 2015 @03:32PM
(#9780379)
Compressed data bandwidth for a video does not scale with resolution. i.e. quadrupling the number of pixels does not require quadruple the bandwidth for the same quality.
I believe it goes up by the square root. So quadrupling the number of pixels needs only double the bandwidth.
There are several reasons for this, one of which is that motion compensation is constant - it doesn't much matter what the resolution is, it takes the same amount of data to encode motion. Another is that as resolution goes up there are more opportunities for similar areas in the image which compress well.
I believe it goes up by the square root. So quadrupling the number of pixels needs only double the bandwidth.
There are several reasons for this, one of which is that motion compensation is constant - it doesn't much matter what the resolution is, it takes the same amount of data to encode motion. Another is that as resolution goes up there are more opportunities for similar areas in the image which compress well.