Description:A set of modules to make the module developement easier
License: Artistic, GPL-2, GPL-1, GPL-3
  • + - stable
  • ~ - unstable
  • M - hardmask
alpha amd64 arm hppa ia64 m68k mips ppc ppc64 s390 sh sparc x86
1.600.0-r2 - ~ - - - - - - - - - - ~

USE flags

  • 3dnow - Use the 3DNow! instruction set
  • aac - Enable support for MPEG-4 AAC Audio
  • alsa - Add support for media-libs/alsa-lib (Advanced Linux Sound Architecture)
  • altivec - Add support for optimizations for G4 and G5/ppc970 processors
  • amr - Enables Adaptive Multi-Rate Audio support
  • bindist - Flag to enable or disable options for prebuilt (GRP) packages (eg. due to licensing issues)
  • bzip2 - Use the bzlib compression library
  • cdio - Enables audio CD grabbing with dev-libs/libcdio.
  • cpudetection - Enables runtime CPU detection (useful for bindist, compatibility on other CPUs)
  • debug - Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see
  • doc - Add extra documentation (API, Javadoc, etc). It is recommended to enable per package instead of globally
  • encode - Add support for encoding of audio or video files
  • fftools_aviocat - cat's a URL to another one, useful for dumping streams.
  • fftools_cws2fws - converts cws files (Macromedia Flash, compressed) to fws ones (Macromedia Flash, uncompressed).
  • fftools_ffeval - A simple expression evalutor.
  • fftools_graph2dot - A tool to convert a libavfilter graph to a dot file.
  • fftools_ismindex - A tool for creating smooth streaming manifests.
  • fftools_pktdumper - Dumps packets as demuxed by libavformat.
  • fftools_qt-faststart - Rearranges a Quicktime file to facilitate network streaming.
  • fftools_trasher - Writes burts of random data into a file. Great for testing error robustness/resilience/concealment.
  • frei0r - Enable frei0r wrapping in libavfilter
  • gnutls - Prefer net-libs/gnutls as SSL/TLS provider (ineffective with USE=-ssl)
  • gsm - Add support for the gsm lossy speech compression codec
  • hardcoded-tables - Use pre-calculated tables rather than calculating them on the fly.
  • ieee1394 - Enable FireWire/iLink IEEE1394 support (dv, camera, ...)
  • jack - Add support for the JACK Audio Connection Kit
  • jpeg2k - Support for JPEG 2000, a wavelet-based image compression format
  • libass - SRT/SSA/ASS (SubRip / SubStation Alpha) subtitle support
  • libv4l - Uses media-libs/libv4l for video4linux instead of direct calls. Adds support for more devices via the userspace library.
  • mmx - Use the MMX instruction set
  • modplug - Add libmodplug support for playing SoundTracker-style music files
  • mp3 - Add support for reading mp3 files
  • neon - Enable optimization support for ARM NEON processors
  • network - Enables network streaming support
  • openal - Add support for the Open Audio Library
  • openssl - Enables dev-libs/openssl support. Adds support for encrypted network protocols (TLS/HTTPS).
  • oss - Add support for OSS (Open Sound System)
  • pic - Force shared libraries to be built as PIC (this is slower)
  • pulseaudio - Add support for PulseAudio sound server
  • sdl - Add support for Simple Direct Layer (media library)
  • speex - Add support for the speex audio codec (used for speech)
  • static-libs - Build static versions of dynamic libraries as well
  • test - Enable dependencies and/or preparations necessary to run tests (usually controlled by FEATURES=test but can be toggled independently)
  • theora - Add support for the Theora Video Compression Codec
  • threads - Add threads support for various packages. Usually pthreads
  • truetype - Add support for FreeType and/or FreeType2 fonts
  • v4l - Enable support for video4linux (using linux-headers or userspace libv4l libraries)
  • vorbis - Add support for the OggVorbis audio codec
  • vpx - Enables VP8 and VP9 codec support using libvpx: Decoding does not require this to be enabled but libvpx can also be used for decoding; encoding requires this useflag to be enabled though.
  • X - Add support for X11
  • x264 - Enable h264 encoding using x264
  • xvid - Add support for's open-source mpeg-4 codec
  • zlib - Add support for zlib (de)compression

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