[MPlayer-users] Difference between vqscale and vqmin/vqmax values (quality vs. quantizer?)

[Jan Knutar]

> This is nonsense. There's no use for two-pass if quantizer is forced
> to 3!!

vcodec=mpeg4:mbd=2:v4mv:trell:cbp:qprd:vqscale=2:psnr (1 pass)
=> Plenty artifacts and errors in resulting bitstream.
PSNR: Y:46.25, Cb:46.30, Cr:48.92, All:46.60


vcodec=mpeg4:mbd=2:v4mv:trell:cbp:qprd:vqmin=2:vqmax=2:vbitrate=8000:psnr 
(2 pass)
=> Ok!
PSNR: Y:46.25, Cb:46.31, Cr:48.92, All:46.61


(huh?)

I'm using a small mpeg2-in-avi clip from a DVD which brings out this 
subtle little difference (or PEBKAC problem). If needed, i can upload 
it to mplayerhq...

That it works with vqmin/max but not vqscale=2 leads me to believe Rich 
randomly asserting that vqscale might be buggy, to be correct ;-)