[MPlayer-cvslog] CVS: main/libmpcodecs ve_lavc.c,1.111,1.112

Loren Merritt lorenm at u.washington.edu
Fri Mar 4 02:42:05 CET 2005

On Thu, 3 Mar 2005, D Richard Felker III wrote:
> On Thu, Mar 03, 2005 at 04:26:42PM -0800, Loren Merritt wrote:
>> (However, constant quality does not mean constant PSNR nor
>> constant QP.
> I'd be very interested in a constant-PSNR rate control engine, to see
> how it would perform in terms of perceptual quality..

Constant PSNR means lower QP in high complexity frames than in low 
complexity. The only cases where I've seen constant PSNR proposed were in 
codecs that don't use scalar quantizers: Some alternatives like bitplane 
coding allow you to see the whole rate-distortion curve of a frame before 
deciding how many bits to give it. But that's not applicable to mpeg-like 

--Loren Merritt

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