[MPlayer-DOCS] r21932 - trunk/DOCS/xml/en/encoding-guide.xml
subversion at mplayerhq.hu
Mon Jan 15 08:23:28 CET 2007
Date: Mon Jan 15 08:23:28 2007
New Revision: 21932
update and factorize information about x264's multi-threading mode
--- trunk/DOCS/xml/en/encoding-guide.xml (original)
+++ trunk/DOCS/xml/en/encoding-guide.xml Mon Jan 15 08:23:28 2007
@@ -1472,8 +1472,8 @@
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.
@@ -3848,6 +3848,20 @@
+ <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).
@@ -4287,10 +4301,12 @@
-oac faac -faacopts br=192:mpeg=4:object=1 -channels 2 -srate 48000 \
- 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>
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