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Remove (audio) codecs section, its contents are part of the usage section.
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<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<chapter id="codecs">
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<title>Codecs</title>
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<para>
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The <ulink url="../../codecs-status.html">codec status table</ulink> is a
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complete list of all supported codecs, regenerated daily.
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Some binary codecs for use with MPlayer are available in the
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<ulink url="http://www.mplayerhq.hu/design7/dload.html#binary_codecs">download section</ulink>
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of our homepage.
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</para>
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<para>
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If you have a Win32 codec which is not supported yet, please read the
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<ulink url="../../tech/win32-codec-howto">Win32 codec HOWTO</ulink>
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and help us add support for it.
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</para>
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<!-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -->
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<sect1 id="audio-codecs">
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<title>Audio codecs</title>
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<sect2 id="swac3">
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<title>Software AC-3 decoding</title>
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<para>
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This is the default decoder used for files with AC-3 audio.
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</para>
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<para>
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The AC-3 decoder can create audio output mixes for 2, 4, or 6 speakers.
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When configured for 6 speakers, this decoder provides separate output of
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all the AC-3 channels to the sound driver, allowing for full "surround
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sound" experience without the external AC-3 decoder required to use the
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hwac3 codec.
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</para>
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<para>
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Use the <option>-channels</option> option to select the number of output
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channels. Use <option>-channels 2</option> for a stereo downmix. For a 4
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channel downmix (Left Front, Right Front, Left Surround and Right Surround
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outputs), use <option>-channels 4</option>. In this case, any center
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channel will be mixed equally to the front channels.
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<option>-channels 6</option> will output all the AC-3 channels as they are
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encoded - in the order Left, Right, Left Surround, Right Surround, Center and
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LFE.
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</para>
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<para>
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The default number of output channels is 2.
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</para>
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<para>
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To use more than 2 output channels, you will need to use OSS, and have a
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sound card that supports the appropriate number of output channels via the
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SNDCTL_DSP_CHANNELS ioctl. An example of a suitable driver is emu10k1
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(used by Soundblaster Live! cards) from August 2001 or newer (ALSA CVS is
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also supposed to work).
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</para>
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</sect2>
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<!-- ********** -->
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<sect2 id="hwac3">
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<title>Hardware AC-3 decoding</title>
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<para>
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You need an AC-3 capable sound card, with digital out (S/PDIF). The card's
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driver must properly support the AFMT_AC3 format (C-Media does). Connect
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your AC-3 decoder to the S/PDIF output, and use the <option>-ac
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hwac3</option> option. It is experimental but known to work with C-Media
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cards and Soundblaster Live! + ALSA (but not OSS) drivers and DXR3/Hollywood+
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MPEG decoder cards.
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</para>
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</sect2>
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<!-- ********** -->
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<sect2 id="hwmpa">
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<title>Hardware MPEG audio codec</title>
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<para>
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This codec (selected by <option>-ac hwmpa</option>) passes through MPEG audio
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packets to hardware decoders, such as the ones found in full-featured DVB cards
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and DXR2 adapters.
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Don't use it in combination with any other audio output device
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(such as OSS and ALSA) that isn't able to decode it (you will hear
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only white noise).
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</para>
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</sect2>
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</sect1>
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</chapter>
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@ -168,8 +168,6 @@ can be distributed under the terms of the GNU General Public License Version 2.
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&cd-dvd.xml;
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&tvinput.xml;
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&radio.xml;
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&codecs.xml;
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&video.xml;
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&audio.xml;
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@ -235,7 +235,6 @@ I have problems playing files with the ... codec. Can I use them?
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<answer><para>
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Check the <ulink url="../../codecs-status.html">codec status</ulink>,
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if it doesn't contain your codec, read the
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<link linkend="codecs">codec documentation</link>, especially the
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<ulink url="../../tech/win32-codec-howto">Win32 codec HOWTO</ulink>
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and contact us.
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</para></answer>
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