[MPlayer-DOCS] CVS: main/DOCS/man/en mplayer.1,1.834,1.835

[Torinthiel]

On Sun, Jan 02, 2005 at 11:38:23PM +0100, Loren Merritt CVS wrote:
> 
> CVS change done by Loren Merritt CVS
> 
> Update of /cvsroot/mplayer/main/DOCS/man/en
> In directory mail:/var2/tmp/cvs-serv20889
> 
> Modified Files:
> 	mplayer.1 
> Log Message:
> x264: group together the primary ratecontrol options. misc clarifications.
> 
> 
> Index: mplayer.1
> ===================================================================
> RCS file: /cvsroot/mplayer/main/DOCS/man/en/mplayer.1,v
> retrieving revision 1.834
> retrieving revision 1.835
> diff -u -r1.834 -r1.835
> --- mplayer.1	2 Jan 2005 14:41:46 -0000	1.834
> +++ mplayer.1	2 Jan 2005 22:38:21 -0000	1.835
> @@ -7068,6 +7068,66 @@
>  This is required if you want a CBR (constant bitrate) encode.
>  .
>  .TP
> +.B qp_constant=<1\-51>
> +This selects the quantizer to use for P-frames.
> +I- and B-frames are offset from this value by ip_factor and pb_factor, respectively.
> +20\-40 is a useful range (default: 26).
> +Lower values result in better fidelity, but higher bitrates.
> +Note that quantization in H.264 works differently from MPEG[124].
> +H.264's quantization parameter (QP) is on a logarithmic scale.
> +As an example, the bitrate difference between QP=20 and QP=40
> +is about a factor of 10.
> +Useful quantizers in H.264 tend to be very large compared to MPEG[124].

I don't get it. If H.264 uses logarithmic scale and MPEG does not, then the values in H.264 should be much smaller. (as log x < x).
Torinthiel

-- 
 Waclaw "Torinthiel" Schiller       GG#: 542916, 3073512
   torinthiel(at)megapolis(dot)pl
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