Average PSNR scores tend to be less meaningful for videos with dramatically varying complexity. Accordingly,
for the second category of tests, OPSNR has been used instead. Average PSNR is also included for reference. “Mix”, the
first test, is a concatenation of Mobile, Akiyo, Husky, and Foreman, respectively. The high improvement on this video in
comparison to the individual test clips demonstrates the effect of the temporal bit distribution properties of macroblock-tree.