This is the default decoder used for files with AC3 audio.

The AC3 decoder can create audio output mixes for 2, 4, or 6 speakers. When configured for 6 speakers, this decoder provides separate output of all the AC3 channels to the sound driver, allowing for full "surround sound" experience without the external AC3 decoder required to use the hwac3 codec.

Use the -channels option to select the number of output channels. Use -channels 2 for a stereo downmix. For a 4 channel downmix (Left Front, Right Front, Left Surround and Right Surround outputs), use -channels 4. In this case, any center channel will be mixed equally to the front channels. -channels 6 will output all the AC3 channels as they are encoded - in the order Left, Right, Left Surround, Right Surround, Center and LFE.

The default number of output channels is 2.

To use more than 2 output channels, you will need to use OSS, and have a sound card that supports the appropriate number of output channels via the SNDCTL_DSP_CHANNELS ioctl. An example of a suitable driver is emu10k1 (used by Soundblaster Live! cards) from August 2001 or newer (ALSA CVS is also supposed to work).

You need an AC3 capable sound card, with digital out (S/PDIF). The card's driver must properly support the AFMT_AC3 format (C-Media does). Connect your AC3 decoder to the S/PDIF output, and use the -ac hwac3 option. It is experimental but known to work with C-Media cards and Soundblaster Live! + ALSA (but not OSS) drivers and DXR3/Hollywood+ MPEG decoder cards.

libmad is a multiplatform, integer (internally 24bit PCM) only MPEG audio decoding library. It does not handle broken files well, and it sometimes has problems with seeking, but it may perform better on FPU-less (such as ARM) platform than mp3lib.

To enable support, compile with the --enable-mad configure option.

This codec (selected by -ac hwmpa) passes through MPEG audio packets to hardware decoders, such as the ones found in full-featured DVB cards and DXR2 adapters. Don't use it in combination with any other audio output device (such as OSS and ALSA) that isn't able to decode it (you will hear only white noise).

The audio codec used in VIVO files depends on whether it is a VIVO/1.0 or VIVO/2.0 file. VIVO/1.0 files have g.723 audio, and VIVO/2.0 files have Vivo Siren audio. Both are supported.

MPlayer supports decoding nearly all versions of RealAudio:

Instructions on how to install the RealPlayer libraries are in the RealVideo section.

QDesign audio streams (fourcc:QDMC, QDM2) are found in MOV/QT files. Both versions of this codec can be decoded with QuickTime libraries. For installation instructions please see the Sorenson video codec section.

Qualcomm audio streams (fourcc:Qclp) is found in MOV/QT files. It can be decoded with QuickTime libraries. For installation instructions please see the Sorenson video codec section.

AAC (Advanced Audio Coding) is an audio codec sometimes found in MOV and MP4 files. An open source decoder called FAAD is available from http://www.audiocoding.com. MPlayer includes a CVS snapshot of libfaad 2.1 beta, so you do not need to get it separately.

If you use gcc 3.2 which fails to compile our internal FAAD or want to use the external library for some other reason, download the library from the download page and pass --enable-external-faad to configure. You do not need all of faad2 to decode AAC files, libfaad is enough. Build it like this:

cd faad2/
sh bootstrap
./configure
cd libfaad
make
make install

Binaries are not available from audiocoding.com, but you can (apt-)get Debian packages from Christian Marillat's homepage, Mandrake/Mandriva RPMs from the P.L.F and RedHat RPMs from Grey Sector.