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update and factorize information about x264's multi-threading mode 

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@21932 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
gpoirier 2007-01-15 07:23:28 +00:00
parent f6a850e2fa
commit f21e80be4f
1 changed files with 22 additions and 6 deletions
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28
DOCS/xml/en/encoding-guide.xml
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@ -1472,8 +1472,8 @@ which widely depend on personal taste and technical constraints.
boost encoding speed — by about 40-60% in typical cases —
with little if any picture degradation.
<systemitem class="library">x264</systemitem> also allows multi-threaded
encoding, which currently speeds up encoding by 15-30% (depending on
the encoding settings) while lowering PSNR by about 0.05dB.
encoding, which currently speeds up encoding by 94% per CPU core while
lowering PSNR between 0.005dB and 0.01dB on a typical setup.
</para>
</listitem>
@ -3848,6 +3848,20 @@ random differences in the achieved bitrate.
clip.
</para>
</listitem>
<listitem id="menc-feat-x264-encoding-options-speedvquality-threads">
<para>
<emphasis role="bold">threads</emphasis>:
This option allows to spawn threads to encode in parallel on multiple CPUs.
You can manually select the number of threads to be created or, better, set
<option>threads=auto</option> and let
<systemitem class="library">x264</systemitem> detect how many CPUs are
available and pick an appropriate number of threads.
If you have a multi-processor machine, you should really consider using it
as it can to increase encoding speed linearly with the number of CPU cores
(about 94% per CPU core), with very little quality reduction (about 0.005dB
for dual processor, about 0.01dB for a quad processor machine).
</para>
</listitem>
</itemizedlist>
</sect3>
@ -4287,10 +4301,12 @@ me=umh:partitions=all:trellis=1:qp_step=4:qcomp=0.7:direct_pred=auto:keyint=300
-oac faac -faacopts br=192:mpeg=4:object=1 -channels 2 -srate 48000 \
-ofps 24000/1001</screen>
If you have multi-processor machine, you can add
<option>threads=auto</option>. This increases encoding speed by about
94% per CPU core, with very little quality penalty (about 0.005dB for
dual processor, about 0.01dB for a quad processor machine).
If you have a multi-processor machine, don't miss the opportunity to
dramatically speed-up encoding by enabling
<link linkend="menc-feat-x264-encoding-options-speedvquality-threads">
<systemitem class="library">x264</systemitem>'s multi-threading mode</link>
by adding <option>threads=auto</option> to your <option>x264encopts</option>
command-line.
</para>
<para>