Hi,
So I've checked the suggested input Res like 1477x831, 1130x635, 1506x847... Do not follow good practice of divisibility by 4 to minimize artifacts from rounding or padding.
One part of the justification comes from 4x4 blocks are standard in processing. Another is padded pixels/edges bleeds spectral energy/noise. Examples integer scaling and/or Wavelet, cosine, haar transform these blocks.
At <=1080p target this is much more important.
For example TRIXX boost skips some non-divisible scales in their config slider.
(In the documents a few Res where badly rounded or off-by-one )
Ps.: at least require mod 2 vertical input (2x2, 2x4 slices)
brunogm0
commented
2 years ago
Hi, So I've checked the suggested input Res like 1477x831, 1130x635, 1506x847... Do not follow good practice of divisibility by 4 to minimize artifacts from rounding or padding.
One part of the justification comes from 4x4 blocks are standard in processing. Another is padded pixels/edges bleeds spectral energy/noise. Examples integer scaling and/or Wavelet, cosine, haar transform these blocks.
At <=1080p target this is much more important.
For example TRIXX boost skips some non-divisible scales in their config slider.
(In the documents a few Res where badly rounded or off-by-one )
Ps.: at least require mod 2 vertical input (2x2, 2x4 slices)