[x265] [PATCH] no-rdo: Replace optimized merge routine to decrease bitrate by 1.6%

[Steve Borho]

On Thu, Oct 3, 2013 at 12:48 AM, <sumalatha at multicorewareinc.com> wrote:

> # HG changeset patch
> # User sumalatha polureddy
> # Date 1380779314 -19800
> # Node ID 942db71c75d2a6abb66bbca3d50fdb6a6a721b2c
> # Parent  2c73823af5223e38d019dbbca56c2aa7fe58245e
> no-rdo: Replace optimized merge routine to decrease bitrate by 1.6%
>
> In original merge routine, best candidate is selected based on the cost of
> encoding with and without residue.
> In optimized routine, the best merge candidate is selected based on cost
> without residue which increased bitrate by 1.6%.
> So replacing optimized routine with original routine to reduce the bitrate
>

What is the performance implication of this?  it sounds like a choice that
should probably be left in the user's hands.


> diff -r 2c73823af522 -r 942db71c75d2 source/encoder/compress.cpp
> --- a/source/encoder/compress.cpp       Wed Oct 02 17:00:40 2013 +0530
> +++ b/source/encoder/compress.cpp       Thu Oct 03 11:18:34 2013 +0530
> @@ -412,7 +412,7 @@
>
>          /* Compute  Merge Cost */
>          bool earlyDetectionSkip = false;
> -        xComputeCostMerge2Nx2N(m_bestMergeCU[depth], m_mergeCU[depth],
> &earlyDetectionSkip, m_modePredYuv[3][depth], m_bestMergeRecoYuv[depth]);
> +        xCheckRDCostMerge2Nx2N(m_bestMergeCU[depth], m_mergeCU[depth],
> &earlyDetectionSkip, m_modePredYuv[3][depth], m_bestMergeRecoYuv[depth]);
>
>          if (!earlyDetectionSkip)
>          {
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-- 
Steve Borho
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