[MPlayer-DOCS] [PATCH] document a couple more x264 options in mencoder.xml

[Jeff Clagg]

Added entries for the me (motion estimation search algorithm) and 4x4mv
options.

For a future patch: the subq discussion needs to be moved down to the
next section.
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Index: mencoder.xml
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RCS file: /cvsroot/mplayer/main/DOCS/xml/en/mencoder.xml,v
retrieving revision 1.69
diff -u -r1.69 mencoder.xml
--- mencoder.xml	20 May 2005 00:20:40 -0000	1.69
+++ mencoder.xml	30 May 2005 20:43:16 -0000
@@ -2263,6 +2263,38 @@
 </para></listitem>
 
 <listitem><para>
+  <emphasis role="bold">me</emphasis>:
+  This option is for choosing the motion estimation search method.
+  Altering this option provides a straightforward quality-vs-speed
+  tradeoff. <option>me=1</option> is only a few percent faster than
+  the default search, at a cost of under 0.1dB global PSNR. The 
+  default setting (<option>me=2</option>) is a reasonable tradeoff
+  between speed and quality. <option>me=3</option> gains a little under
+  0.1dB global PSNR, with a speed penalty that varies depending on
+  <option>frameref</option>.  At high values of
+  <option>frameref</option> (e.g. 12 or so), <option>me=3</option>
+  is about 40% slower than the default <option> me=2</option>. With
+  <option>frameref=3</option>, the speed penalty incurred drops to
+  25%-30%.
+</para>
+<para>
+  <option>me=4</option> uses an exhaustive search that is too slow for
+  practical use.
+</para>
+</listitem>
+
+<listitem><para>
+  <emphasis role="bold">4x4mv</emphasis>:
+  This option enables the use of 8x4, 4x8 and 4x4 subpartitions in
+  predicted macroblocks. Enabling it results in a fairly consistent
+  10%-15% loss of speed. This option is rather useless in source
+  containing ony low motion, however in some high-motion source,
+  particularly source with lots of small moving objects, gains of
+  about 0.1dB can be expected.
+</para>
+</listitem>
+   
+<listitem><para>
   <emphasis role="bold">bframes</emphasis>:
   The usefulness of B-frames is questionable in most other codecs
   you may be used to.