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various improvements of the section "Choosing the video codec"

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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@17756 b3059339-0415-0410-9bf9-f77b7e298cf2
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gpoirier 2006-03-06 07:19:00 +00:00
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DOCS/xml/en/encoding-guide.xml
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@ -1356,15 +1356,17 @@ Do not do this! Always use a file or CD/DVD/etc device as input.
<title>Choosing the video codec</title>
<para>
Choosing the video codec to use depends on several factors, some of
Which video codec is best to choose depends on several factors,
like size, quality, streamability, usability and popularity, some of
which widely depend on personal taste and technical constraints.
</para>
<itemizedlist>
<listitem><para>
<emphasis role="bold">Compression efficiency</emphasis>:
It is quite easy to understand that newer-generation codecs are made
to yield better picture quality than previous generations.
Therefore, you cannot go wrong
It is quite easy to understand that most newer-generation codecs are
made to increase quality and compression.
Therefore, the authors of this guide and many other people suggest that
you cannot go wrong
<footnote id='fn-menc-feat-dvd-mpeg4-codec-cpu'>
<para>Be careful, however: Decoding DVD-resolution MPEG-4 AVC videos
requires a fast machine (i.e. a Pentium 4 over 1.5Ghz or a Pentium M
@ -1374,12 +1376,11 @@ Do not do this! Always use a file or CD/DVD/etc device as input.
<systemitem class="library">x264</systemitem> instead of MPEG-4 ASP codecs
such as <systemitem class="library">libavcodec</systemitem> MPEG-4 or
<systemitem class="library">XviD</systemitem>.
(To get a better grasp of what the fundamental differences between
MPEG-4 ASP and MPEG-4 AVC are, you would be well advised to read the entry
"<ulink url="http://guru.multimedia.cx/?p=10">15 reasons why MPEG4 sucks</ulink>"
from Michael Niedermayer's blog.)
Likewise, you should get better quality using MPEG-4 ASP instead
of MPEG-2 codecs.
(Advanced codec developers may be interested in reading Michael
Niedermayer's opinion on
"<ulink url="http://guru.multimedia.cx/?p=10">why MPEG4-ASP sucks</ulink>".)
Likewise, you should get better quality using MPEG-4 ASP than you
would with MPEG-2 codecs.
</para>
<para>
However, newer codecs which are in heavy development can suffer from
@ -1417,22 +1418,23 @@ Do not do this! Always use a file or CD/DVD/etc device as input.
</para>
<para>
If you are after blazing speed you should stick around the default
settings of the video codec (which does not mean you should not experiment
with some of the options which are mentioned in other sections
of this guide).
settings of the video codec (although you should still try the other
options which are mentioned in other sections of this guide).
</para>
<para>
You may also consider choosing a codec which can do multi-threaded
processing.
processing, though this is only useful for users of machines with
several CPUs.
<systemitem class="library">libavcodec</systemitem> MPEG-4 does
allow that, resulting in small speed gains at the price of lower
picture quality.
<systemitem class="library">XviD</systemitem> has some experimental
patches available to boost encoding speed, by about 40-60% in typical
cases, with low picture degradation.
allow that, but speed gains are limited, and there is a slight
negative effect on picture quality.
<systemitem class="library">XviD</systemitem>'s multi-threaded encoding,
activated by the <options>threads</option> option, can be used to
boost encoding speed &mdash; by about 40-60% in typical cases &mdash;
with little if any picture degradation.
<systemitem class="library">x264</systemitem> also allows multi-threaded
encoding, which currently speeds-up encoding by 15-30% while lowering
PSNR by about 0.05dB.
encoding, which currently speeds up encoding by 15-30% (depending on
the encoding settings) while lowering PSNR by about 0.05dB.
</para></listitem>
<listitem><para>
@ -1444,9 +1446,12 @@ Do not do this! Always use a file or CD/DVD/etc device as input.
<systemitem class="library">x264</systemitem>.
</para>
<para>
Make your own judgment, and do not always listen to what some people will
tell you to do or think: The best codec is the one you master the best,
and the one that looks best to your eyes on your display
You should make your own judgement; do not take advice from people who
swear by one codec.
Take a few sample clips from raw sources and compare different
encoding options and codecs to find one that suits you best.
The best codec is the one you master, and the one that looks
best to your eyes on your display
<footnote id='fn-menc-feat-dvd-mpeg4-codec-playback'>
<para>The same encode may not look the same on someone else's monitor or
when played back by a different decoder, so future-proof your encodes by