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Encoding setting examples for x264

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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@16278 b3059339-0415-0410-9bf9-f77b7e298cf2
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gpoirier 2005-08-20 20:13:03 +00:00
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DOCS/xml/en/encoding-guide.xml
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@ -3201,6 +3201,50 @@ codec</title>
</itemizedlist>
</sect3>
</sect2>
<sect2 id="menc-feat-x264-example-settings">
<title>Encoding settings examples</title>
<para>
The following settings are examples of different encoding
options combinations that affect the speed VS quality tradeoff
given the same target bitrate.
If you are aiming at perfect quality without too much thinking and
no size limitation, a low constant quantizer encode (like with
<option>qp_constant=18</option>) with no B-frames
(<option>bframes=0</option>) will probably look very good, but
will needlessly spend lots of bits to encode details that could be
coded more wisely using some advanced settings.
</para>
<para>
All the encoding settings were tested on a 720x448 @30000/1001 fps
video sample, the target bitrate was 900kbps, and the machine was an
AMD-64 3400+ at 2400 Mhz in 64 bits mode.
Each encoding setting is followed by the encoding speed (in frames
per seconds), the compression efficiency loss (in percent of bitrate)
compared to the "very high quality" setting, and the PSNR loss (in dB).
Please understand that depending on your source your machine type
and the development breakthrough, you may get very different results.
</para>
<itemizedlist>
<listitem><para><emphasis role="bold">Very high quality:</emphasis>
<option>subq=6:4x4mv:8x8dct:me=3:frameref=5:bframes=3:b_pyramid:weight_b</option>
6fps, 0%, 0dB.
</para></listitem>
<listitem><para><emphasis role="bold">High quality:</emphasis>
<option>subq=5:4x4mv:8x8dct:frameref=2:bframes=3:b_pyramid:weight_b:psnr</option>
13fps, -13%, -0.89dB.
</para></listitem>
<listitem><para><emphasis role="bold">Fast:</emphasis>
<option>subq=4:bframes=2:b_pyramid:weight_b:psnr</option>
17fps, -20%, -1.48dB.
</para></listitem>
</itemizedlist>
</sect2>
</sect1>
<sect1 id="menc-feat-vcd-dvd">