[x264-devel] Re: Defining video quality

[Loren Merritt]

On Fri, 8 Dec 2006, rupert.mish at comcast.net wrote:

> Is the lambda for rate distortion function a fixed value? How has it 
> been chosen? I'll appreciate any help.

lambda is a function of QP. Or QP is a function of lambda, if you want to 
look at it that way.

The function was chosen by experiment: encode lots of videos with lots of 
(lambda,QP) pairs, graph the results, and keep the best points on the 
rate-distortion curve.

--Loren Merritt

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