[x265] A patch for ABR of x265

[Steve Borho]

On Mon, Oct 28, 2013 at 8:12 AM, <idxa at sina.com> wrote:

> Hi,
>
> The reason for more fluctuation of PSNR is  that the value of
> cfg->param.rc.rateTolerance has been set too small. And I try testing with
> -F 1, the result is same, maybe it depends on video context.
>
> I have written a patch to fix some bugs of ABR,
> 1. modify rateTolerance from 0.1 to 1.0, in order to allow the final
> bitrate to fluctuate more(CBR to ABR)
>
> 2. the value of ncu in initialization of ratecontrol has been set according to 16x16 block size which is same to x264, for corresponding empirical formula in x264 is for 16x16 block
>
> 3. do more modification to make ratecontrol algorithm of x265 more similar to x264, for x264 has been developed for about 10 years and is very mature , it is reasonale to take its methods first.
>
>
Thanks, these results look promising.  I'm going to hold off the 0.5 tag
until Aarthi reviews this change.  If all goes well, this will be the last
change on the stable branch prior to tagging.

--
Steve Borho
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