[x264-devel] Re: rate control question

[alexander tian]

Hi,shauli

The three VBV parameters are very important in the rate control. Especially
if you want to make the 1pass(ABR and CBR)  or 2pass encoding.

 I make 1pass(CBR) by using x264 encoding.At last I get the satisfied result
by using below parameter:
--bitrate 2000 --ratetol 0.01 --vbv-maxrate 2000 --vbv-bufsize 1800
--vbv-init 0.1 --qcomp 0 --bframes 2 --no-b-adapt --verbose -o E:\test.264
E:\yuv.yuv 720x576

So you could comprehend these parameters if you could make 1pass CBR by
using the x264. In the other hand you could get some help by search some
topic in the web "http://forum.doom9.org/forumdisplay.php?f=77".

2005/12/7, Corey Hickey <bugfood-ml at fatooh.org>:
>
> shauli rozen wrote:
> > Can any one give me some explanations on the rate control setting
> > I am using the code , and need help figuring out the effect of these
> > variables:
> >
> >
> > rc.i_vbv_max_bitrate ;
> >
> > rc.i_vbv_buffer_size ;
> >
> > rc.f_vbv_buffer_init ;
> >
> > rc.f_ip_factor ;
> >
> > rc.f_pb_factor ;
>
> In case nobody else gives you a better answer, here are what I assume to
> be the corresponding descriptions from the mplayer man page.
>
> vbv_maxrate=<value> (ABR or two pass)
>        maximum local bitrate, in kbits/second (default: disabled)
>
> vbv_bufsize=<value> (ABR or two pass)
>        averaging period for vbv_maxrate, in kbits (default: none, must
>        be specified if vbv_maxrate is enabled)
>
> vbv_init=<0.0-1.0> (ABR or two pass)
>        initial buffer occupancy, as a fraction of vbv_bufsize (default:
>        0.9)
>
> ip_factor=<value>
>        quantizer factor between I- and P-frames (default: 1.4)
>
> pb_factor=<value>
>        quantizer factor between P- and B-frames (default: 1.3)
>
>
> -Corey
>
> --
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>
>
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