[MPlayer-users] Re: variable bitrate, fixed quality

Jonathan Rogers jonner at teegra.net
Thu Jul 10 07:20:13 CEST 2003

Nikolaus Rath wrote:
> Of course, this makes sense. But unfortunately the manpage doesn't say
> what the rate control function actually is and what it can return. So
> even if you understand the function you won't have the slightest idea
> in which way this modifies the codecs behaviour.

The default function actually is "tex^qComp" according to the manpage. 
Read it, you'll like it.

> Maybe you can say a bit about the return value of the function? How
> does the rate controlling work? 

I don't know the all the details, but the manpage does say that if the 
function has a value of 1, bitrate will be constant and if it has a 
value of "tex" (texture complexity) there will be constant quality. 
Clearly, the closer qComp (or vqcomp) is to 1, the more constant the 
quality will be, since n^1=n.

Jonathan Rogers

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