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2.1 Requirements

For compiling x264, you need nasm (yasm on x86_64). They are included in most distributions. Required libraries can be installed from source or from binary packages. In the latter case, you must install the development packages (e.g. libfoo-devel-1.2.3-4.i386.rpm) also. This is what you need:

Alsa
It's the recommended audio architecture
esound
Only needed if neither Alsa nor OSS work for you.
flac
For en-/decoding flac files (optional).
gtk-2.4.x
This is needed for compiling the GUI applications. Without it you'll get just the core library, which won't be of much use.
libjpeg
For reading and writing single JPEG images (strongly recommended)
libpng
For reading and writing single PNG images (strongly recommended). Also for decoding png encoded Quicktime and AVI files
libtiff
For reading and writing single TIFF images (Optional)
libxml
Required. All kinds of configuration files as well as the media tree are xml based.
vorbis
Needed for en-/decoding Vorbis files. Also required for the theora encoding.
libmusicbrainz
Needed for getting Audio CD metadata using musicbrainz
libcddb
Needed for getting Audio CD metadata from CDDB servers
Headers for libXv and libXinerama
These are usually shipped with X11 but some distributions pack the header files separately (e.g. libxv-dev, libxinerama-dev). libXv is needed for hardware accelerated video playback, libXinerama adds support for multi-screen configurations.
libsmbclient
For loading smb:// URLs (optional).
libvisual
For using libvisual plugins (optional).
Ladspa plugins
Optional for audio filters/effects. Good experiences were made with the plugin packages cmt, swh-plugins and tap-plugins. Gmerlin looks for them at runtime, so you can install them at any time.

From now on, there are 2 ways to proceed:

libcdio
Neccessary for the VCD, Audio CD and DVD plugins.
faad2
Needed for MPEG-4 audio support (mp4, aac files).
faac
Needed for MPEG-4 audio encoding (.aac files) and for AAC encoding via libquicktime.
FFmpeg
Many codecs, strongly recommended. You should get a sufficiently new version from ffmpeg SVN and use –enable-shared when calling configure. Another option is the version in the gmerlin-dependencies package.
lame
For encoding mp3 files and AVIs with mp3 audio streams with libquicktime.
mad
For playing MPEG-1/2 audio (e.g. mp3)
libdvdread
For playing DVDs. Gmerlins method of accessing DVD drives doesn't differ much from others. Thus, DVD playback howtos found in the web apply for gmerlin as well.
x264
For H.264 encoding with libquicktime.
libdca
For decoding DTS streams.
libmpeg2
For decoding MPEG-1/2 Video (like .mpg files and DVD video)
liba52
For playing AC3 (aka DVD audio) streams.
libmpcdec
For playing musepack files (optional).
theora
For en-/decoding theora video (optional).
speex
For en-/decoding Speex streams (optional).
libquicktime
Optional, for the libquicktime based encoding and decoding plugins. Mostly necessary if you want to encode video. For decoding Quicktime, gmerlin_avdecoder is a lot better.
mjpegtools
Optional for en-/decoding yuv4mpeg streams and for encoding high quality MPEG video using mpeg2enc and friends.