[MPlayer-users] vbirtate

[Wayde Milas]

On Thu, 2004-02-26 at 05:17, Pablo Morales wrote:
> HI there guys.
> I'm having this problem, I'm trying to encode a  vob file with this
> parameters to have it fit in two 800MB CD, ( one file of 1600GB ) the
> problem is that mplayer goes down the vbitrate I tell it to use, it doesn't
> matters if I use vqscale=2 or vbirtate=3000, mplayer always end in a
> vbitrate that varies from 900 and  1700, and the file size reduces and is
> not what I want.
> 
> I'ts there a way to force a vbitrate?, I tried with vrc_min/maxrate, one
> pas, two pass, but it's the same, this is not the first time that happens to
> me, with some vob or dvd works fine, with others, it's pure pain, and cannot
> rip them, If I include trell, cbp to the list of parameters  it's worst, if
> goes down to a vbitrate of 320,  I'm usign mplayer pre3.3.3.
> 
> Any idea, i't a bug? , it' me? thanx..
> 
> mencoder dracula2000-.vob -o Dracula2000.avi -ovc lavc -lavcopts
> vcodec=mpeg4:vbitrate=2000:mbd=2:mv0:v4mv -vf
> crop=714:480:4:0,scale=512:384 -sws 7 -sid 2 -aid 128 -oac mp3lame -lameopts
> cbr:br=160

You are describing a sitation where q=2 an its not using 3k bits on
average. Thinka bout it. Thats a GOOD thing. At q=2 mplayer is using all
the bits it needs and it still has leftover bits its not using.

If you REALLY want to inflate your bit stream, try not scaling as much.
You'll preserve more data for the compressor to us, thus elevating its
need for a higher bitrate.

Basicly, if you tell the encoder to use X number of bits, but it only
takes X-Z number of bits to encode the stream and the lowest quantizer
you ahve supplied, its going to ignore your bit stream maximum number
and jsut use what it needs.

wayde