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39 lines
1.9 KiB
XML
39 lines
1.9 KiB
XML
<sect2>
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<title>Contents</title>
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<para>The <application>XviD</application> core package contains the <filename
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class="libraryfile">libxvidcore</filename> library and the
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appendant header files. The library itself provides functions to encode
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and decode most MPEG-4 video data.</para>
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<para>Following features of MPEG-4 are supported:</para>
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<para><emphasis>I, P Frame encoding</emphasis></para>
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<para>I-Frames are image frames, while P-Frames are Pattern Frames.
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Image Frames contain full images. P-Frames contain patterns of what changes in
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the image, thusly saving a lot of space.</para>
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<para><emphasis>PMVFast and EPZS with diamond a sqare pattern motion
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estimation</emphasis></para>
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<para>Fast Motion detection that can refer a square or diamond
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shaped pattern to different directions.</para>
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<para><emphasis>inter4v mode</emphasis></para>
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<para>Fast interpolation ability.</para>
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<para><emphasis>fullpixel and halfpixel precision</emphasis></para>
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<para>Even halfpixel movements can be encoded. Better precision
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results in better compression at better quality.</para>
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<para><emphasis>both MPEG-4 and H263 quantizations</emphasis></para>
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<para>MPEG-4 is the standard DivX was derived from. H263 is a
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slightly changed subset of that standard made by Microsoft. Quantization
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means to map the quantity of color values to numbers.</para>
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<para><emphasis>custom quant matrices</emphasis></para>
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<para>The quantization can be done using custom matrices,
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possibly giving better results if the matrix is made to suit the video
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data. Every normal user should be fine with the default matrix that comes
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with <application>XviD</application>.</para>
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<para><emphasis>Adaptive quantization / Luminance masking</emphasis></para>
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<para>Qantization and Luminance masking are variant, depending
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on the input material, therefore providing better results on dark or very
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contrasting images.</para>
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</sect2>
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