[x265] multi-pass: enable slow-firstpass by default.

[Deepthi Nandakumar]

# HG changeset patch
# User Deepthi Nandakumar <deepthi at multicorewareinc.com>
# Date 1463741055 -19800
#      Fri May 20 16:14:15 2016 +0530
# Node ID 1b2b9128cffe63f3e19d130e9f15db3445b70abe
# Parent  aca781339b4c8dae94ff7da73f18cd4439757e87
multi-pass: enable slow-firstpass by default.

The better the match across multi-pass encode settings, the better the
efficiency
improvement from each pass.

diff -r aca781339b4c -r 1b2b9128cffe doc/reST/cli.rst
--- a/doc/reST/cli.rst Tue May 10 15:33:17 2016 +0530
+++ b/doc/reST/cli.rst Fri May 20 16:14:15 2016 +0530
@@ -1360,13 +1360,13 @@

 .. option:: --slow-firstpass, --no-slow-firstpass

- Enable a slow and more detailed first pass encode in multi-pass rate
- control mode.  Speed of the first pass encode is slightly lesser and
- quality midly improved when compared to the default settings in a
- multi-pass encode. Default disabled (turbo mode enabled)
+ Enable first pass encode with the exact settings specified.
+ The quality in subsequent multi-pass encodes is better
+ (compared to first pass) when the settings match across each pass.
+ Default enabled.

- When **turbo** first pass is not disabled, these options are
- set on the first pass to improve performance:
+ When slow first pass is disabled, a **turbo** encode with the following
+ go-fast options is used to improve performance:

  * :option:`--fast-intra`
  * :option:`--no-rect`
diff -r aca781339b4c -r 1b2b9128cffe source/common/param.cpp
--- a/source/common/param.cpp Tue May 10 15:33:17 2016 +0530
+++ b/source/common/param.cpp Fri May 20 16:14:15 2016 +0530
@@ -221,7 +221,7 @@
     param->rc.qblur = 0.5;
     param->rc.zoneCount = 0;
     param->rc.zones = NULL;
-    param->rc.bEnableSlowFirstPass = 0;
+    param->rc.bEnableSlowFirstPass = 1;
     param->rc.bStrictCbr = 0;
     param->rc.bEnableGrain = 0;

@@ -415,7 +415,6 @@
             param->bEnableRecursionSkip = 0;
             param->maxNumReferences = 5;
             param->limitReferences = 0;
-            param->rc.bEnableSlowFirstPass = 1;
             param->bIntraInBFrames = 1;
             param->lookaheadSlices = 0; // disabled for best quality
             // TODO: optimized esa


-- 
Deepthi Nandakumar
Engineering Manager, x265
Multicoreware, Inc
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