[MPlayer-DOCS] minor encoding-tips thinko fix

[Jeff Clagg]

On Tue, Feb 28, 2006 at 04:12:25PM -0500, The Wanderer wrote:
> Jeff Clagg wrote:
> 
> >-  decisions about which quantizers to use. During fast action or low
> >+  decisions about which quantizers to use. During fast action or high 
> 
> You added trailing whitespace here.

Oops, fixed patch attached.

> >-  slow moving or high detail scenes, lower quantizers will be used.
> >+  slow moving or low detail scenes, lower quantizers will be used.
> 
> Hmm. Which one corresponds to "higher quality" - high quantizer, or low
> quantizer?

Low quantizer is higher quality.

> I think the intent of the part you've changed was to state that scenes
> with fast action and/or low detail will be encoded at lower relative
> quality. This seems reasonable, on the grounds that in low-detail scenes
> there is less information to need to preserve, and in fast-motion scenes
> the viewer is less likely to be able to catch the details in time anyway
> so preserving them is less useful.

No.

Less information there to preserve means it doesn't cost as much to
preserve the data that IS there, so use a lower quantizer. Worse, the
eye is better at picking out errors introduced in low detail areas.
Errors in high detail areas tend to get "lost in the noise" of detail.
-------------- next part --------------
Index: DOCS/xml/en/encoding-guide.xml
===================================================================
RCS file: /cvsroot/mplayer/main/DOCS/xml/en/encoding-guide.xml,v
retrieving revision 1.41
diff -u -r1.41 encoding-guide.xml
--- DOCS/xml/en/encoding-guide.xml	26 Feb 2006 09:35:21 -0000	1.41
+++ DOCS/xml/en/encoding-guide.xml	28 Feb 2006 20:51:54 -0000
@@ -377,9 +377,11 @@
   With a two pass encode, the first pass will rip the movie as though it
   were CBR, but it will keep a log of properties for each frame. This
   data is then used during the second pass in order to make intelligent
-  decisions about which quantizers to use. During fast action or low
+  decisions about which quantizers to use. During fast action or high
   detail scenes, higher quantizers will likely be used, and during
-  slow moving or high detail scenes, lower quantizers will be used.
+  slow moving or low detail scenes, lower quantizers will be used.
+  Normally, the amount of motion is much more important than the
+  amount of detail.
 </para>
 
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