source: multimedia/libdriv/xvid.xml@ bad03ecd

<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
   "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../../general.ent">
  %general-entities;

  <!ENTITY xvid-download-http "http://files.xvid.org/downloads/xvidcore-&xvid-version;.tar.bz2">
  <!ENTITY xvid-download-ftp  " ">
  <!ENTITY xvid-size          "541 KB">
  <!ENTITY xvid-buildsize     "7.1 MB">
  <!ENTITY xvid-time          "0.19 SBU">
]>

<sect1 id="xvid" xreflabel="XviD-&xvid-version;">
<sect1info>
<othername>$LastChangedBy$</othername>
<date>$Date$</date>
</sect1info>
<?dbhtml filename="xvid.html"?>
<title>XviD-&xvid-version;</title>

<sect2>
<title>Introduction to <application>XviD</application></title>

<!--
OpenDivX or Xvid?

OpenDivX is a free implementation of the mpeg4-codec. Alas, the 
developers at ProjectMayo didn't gratefully release their actual source
in compileable versions, so the displeasure of the users majority
canalized into a new project named Xvid.

Xvid development was interrupted in Autumn 2002 due to a code-theft 
the developers at Sigma design committed but it is continued now.

For worse luck, OpenDivX and Xvid are using the same header file 
names (an issue that wouldn't be resolved easily) and function
namespace, so you'll have to choose which one to use.

I personally vote for Xvid, because the installation from sources
is much smoother. If you use mencoder and transcode at the same time,
you may want to choose different codecs for each.
-->

<para><application>XviD</application> is a <acronym>MPEG</acronym>-4
compliant video <acronym>CODEC</acronym>.</para>

<sect3><title>Package information</title>
<itemizedlist spacing='compact'>
<listitem><para>Download (HTTP): 
<ulink url="&xvid-download-http;"/></para></listitem>
<listitem><para>Download (FTP): 
<ulink url="&xvid-download-ftp;"/></para></listitem>
<listitem><para>Download size: &xvid-size;</para></listitem>
<listitem><para>Estimated Disk space required: 
&xvid-buildsize;</para></listitem>
<listitem><para>Estimated build time: 
&xvid-time;</para></listitem></itemizedlist>
</sect3>

<sect3><title><application>XviD</application> dependencies</title>
<sect4><title>Optional</title>
<para><xref linkend="NASM"/></para></sect4>
</sect3>

</sect2>

<sect2>
<title>Installation of <application>XviD</application></title>

<para>Install <application>XviD</application> by running the following 
commands:</para>

<screen><userinput><command>cd build/generic &amp;&amp;
./configure --prefix=/usr &amp;&amp;
make  &amp;&amp;
make install &amp;&amp;
ln -sf libxvidcore.so.4.0 /usr/lib/libxvidcore.so.4 &amp;&amp;
ln -sf libxvidcore.so.4 /usr/lib/libxvidcore.so</command></userinput></screen>

</sect2>

<sect2>
<title>Command explanations</title>

<para><command>ln -s libxvidcore.so.4 /usr/lib/libxvidcore.so</command>:
This command makes applications linked against
<filename class="libraryfile">.so</filename> names, link to
<filename class="libraryfile">.so.<replaceable>MAJOR</replaceable></filename>.
This ensures better binary compatibility, as
<application>XviD</application> developers take care not changing the
<replaceable>MAJOR</replaceable> number until there is an incompatible
<acronym>ABI</acronym> change.</para>

</sect2>

<sect2>
<title>Contents</title>

<para>The <application>XviD</application> core package contains the 
<filename class="libraryfile">libxvidcore</filename> library.</para>

</sect2>

<sect2><title>Description</title>

<sect3><title>libxvidcore</title>
<para><filename class="libraryfile">libxvidcore</filename> provides
functions to encode and decode most <acronym>MPEG</acronym>-4 video
data.</para></sect3>

<!--
<para>Following features of MPEG-4 are supported:</para>
<para><emphasis>I, P Frame encoding</emphasis></para>
<para>I-Frames are image frames, while P-Frames are Pattern Frames.
Image Frames contain full images. P-Frames contain patterns of what changes in
the image, thusly saving a lot of space.</para>
<para><emphasis>PMVFast and EPZS with diamond a sqare pattern motion 
estimation</emphasis></para>
<para>Fast Motion detection that can refer a square or diamond
shaped pattern to different directions.</para>
<para><emphasis>inter4v mode</emphasis></para>
<para>Fast interpolation ability.</para>
<para><emphasis>fullpixel and halfpixel precision</emphasis></para>
<para>Even halfpixel movements can be encoded. Better precision
results in better compression at better quality.</para>
<para><emphasis>both MPEG-4 and H263 quantizations</emphasis></para>
<para>MPEG-4 is the standard DivX was derived from. H263 is a
slightly changed subset of that standard made by Microsoft. Quantization
means to map the quantity of color values to numbers.</para>
<para><emphasis>custom quant matrices</emphasis></para>
<para>The quantization can be done using custom matrices,
possibly giving better results if the matrix is made to suit the video
data. Every normal user should be fine with the default matrix that comes
with <application>XviD</application>.</para>
<para><emphasis>Adaptive quantization / Luminance masking</emphasis></para>
<para>Qantization and Luminance masking are variant, depending
on the input material, therefore providing better results on dark or very
contrasting images.</para>
-->

</sect2>

</sect1>