[x265] Optimize slice QP in PPS for x265

[Deepthi Nandakumar]

Thanks - this is a high priority item for low bitrate encodes.

On Mon, Sep 26, 2016 at 11:46 PM, xuefeng <xuefeng at multicorewareinc.com>
wrote:

> All,
> hello!
>
>  x265 set the slice QP in PPS to 26.  Bits can be saved by
> calculating a closer approximation to the actual
> slice QP values utilized to encode the bitstream at
> different quality levels. The delta QP in each slice header
> is huge especially at low bit rate and quality levels.
>
> My test command is as follows.
> *--repeat-headers --hash 1  --input-res 1280x720 --keyint 30
> --min-keyint 30
> --input "Johnny_1280x720.y4m" --fps 30 --output "test_new.mp4" *
>
> There is a patch in the attachment for this method based on "*Changeset: **11587
> (d20b78d6d138)*".
> There is information for x265 coding to see that bitrate goes down.
> There is informations for HM decoding to see that MD5 and QP are the same
> with the method.
>
>
>
> ------------------------------
> Regards,
>
>              Xuefeng Jiang
>
> xuefeng at multicorewareinc.com
>
>
>
>
> _______________________________________________
> x265-devel mailing list
> x265-devel at videolan.org
> https://mailman.videolan.org/listinfo/x265-devel
>
>


-- 
Deepthi
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