[MPlayer-DOCS] CVS: main/DOCS/xml/en encoding-guide.xml,1.5,1.6

[Guillaume Poirier CVS]

CVS change done by Guillaume Poirier CVS

Update of /cvsroot/mplayer/main/DOCS/xml/en
In directory mail:/var2/tmp/cvs-serv6511/DOCS/xml/en

Modified Files:
	encoding-guide.xml 
Log Message:
Why multipass is better in a nutshell. Taken from Rich's encoding guide.


Index: encoding-guide.xml
===================================================================
RCS file: /cvsroot/mplayer/main/DOCS/xml/en/encoding-guide.xml,v
retrieving revision 1.5
retrieving revision 1.6
diff -u -r1.5 -r1.6
--- encoding-guide.xml	5 Aug 2005 21:44:28 -0000	1.5
+++ encoding-guide.xml	12 Aug 2005 13:27:26 -0000	1.6
@@ -289,6 +289,19 @@
   (CBR), constant quantizer, and multipass (ABR, or average bitrate).
 </para>
 
+<para>
+  The complexity (and thus the number of bits) required to compress the
+  frames of a movie can vary greatly from one scene to another.
+  Modern video encoders can adjust to these needs as they go and vary
+  the bitrate.
+  However, in simple modes such CBR, they cannot exceed the requested
+  average bitrate for long stretches of time, because they do not know
+  the bitrate needs of future scenes.
+  Wiser modes, such as multipass encode can take into account the
+  statistics from previous passes, which fixes the problem mentioned
+  above.
+</para>
+
 <note><title>Note:</title>
 <para>
   Most codecs which support ABR encode only support two pass encode