[MPlayer-dev-eng] Re: [PATCH] mplayer.1: lavcopts lmin/lmax, vrc_buf_size

[Tobias Diedrich]

Michael Niedermayer wrote:

> no, its not correct, they limit the lagrange multiplier and their range is 
> 0.01 - 255.0 
> and no i dont have a simple/understandable explanation
> but the basic idea is rate control -> lambda-> quantizer (QP)
> and 0.85QP^2 ~ lambda^2 or 0.92QP ~ lambda
> so for simplicity we "scale" lambda to the QP range externally
> lambda^2 is the lagrange multipler (for the SSE distortion function)
> 

Then how about:

.B lmin=<0.01\-255.0>
Minimum lagrange multiplier for ratecontrol, you probably want it to be
equal to or lower than vqmin. (default: 2.0)
.RE
.TP
.B lmax=<0.01\-255.0>
Maximum lagrange multiplier for ratecontrol. (default: 31.0)
.RE
.TP

-- 
Tobias						PGP: http://9ac7e0bc.2ya.com
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