Update with new mencoder sample:
Mencoder with Compliant Vector Range Limitation
Special Mencoder but I don't know if it's really compliant
Mencoder-Optimum.m2v is the very best for metric and by far:
PSNR = 47.25 dB
SSIM = 83.51
@ hank315
You can check the MPEG compliance for these mencoder sample ... ???