Change zm_factor for Vizier.
Changes the exposed zm_factor parameter.
This patch alters the meaning of the zm_factor
parameter that will be exposed for the Vizier project.
The previous power factor was hard to interpret in terms
of its meaning and effect and has been replaced by a linear factor.
Given that the initial Vizier results suggested a lower zero motion
effect for all formats, the default impact has been reduced.
The patch as it stands gives a modest improvement for PSNR
but is slightly down on some sets for SSIM
(overall psnr, ssim % bdrate change: -ve is better)
lowres -0.111, 0.001
ugc360p -0.282, -0.068
midres2 -0.183, 0.059
hdres2 -0.042, 0.172
6 files changed