[MPlayer-users] Re: variable bitrate, fixed quality
jonner at teegra.net
Wed Jul 9 20:07:21 CEST 2003
Nikolaus Rath wrote:
>>They're explained in the mplayer man page.
> Yes. But an explanation like
> quantizer compression, depends upon vrc_eq (pass 1/2)
> (default: 0.5)
> isn't really helpful if you aren't an MPEG developer.
> Your explanation below is indeed very good. I think that this type of
> explanation should be in the manpage.
It is explained mathematically in the entry for vrc_eq. The default
function is "tex^qComp", which means that if vqcomp is 0, the
ratecontrol function always returns 1, meaning constant bitrate. If
vqcomp is 1, bitrate varies directly with texture complexity, meaning
constant quality. Understaning of algebra is necessary, but it is
probably necessary anyway to understand something inherently
mathematical like video encoding.
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