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USE flags

• 3dnow - Adds support for 3dnow multimedia processor instructions
• a52 - Enables support for decoding ATSC A/52 streams used in DVD
• aac - Enables support for MPEG-4 AAC Audio
• alsa - Adds support for media-libs/alsa-lib (Advanced Linux Sound Architecture)
• altivec - Adds support for optimizations for G4 and G5/ppc970 processors
• dv - Enables support for a codec used by many camcorders
• dvd - Adds support for DVDs
• iconv - Enable support for the iconv character set conversion library
• imagemagick - Enables support for Imagemagick (image converter)
• jpeg - Adds JPEG image support
• lzo - Enables support for lzo compression
• mjpeg - Enables mjpegtools support
• mmx - Adds support for optimizations for Pentium MMX and Athlon class processors
• mp3 - Add support for reading mp3 files
• mpeg - Adds libmpeg3 support to various packages
• nuv - NuppelVideo container format demuxing
• ogg - Adds support for the Ogg container format (commonly used by Vorbis, Theora and flac)
• oss - Adds support for OSS (Open Sound System)
• pic - disable optimized assembly code that is not PIC friendly
• postproc - Build with ffmpeg libpostproc support
• quicktime - Adds support for OpenQuickTime
• sdl - Adds support for Simple Direct Layer (media library)
• sse - fast floating point optimization for PentiumIII+ class chips
• sse2 - faster floating point optimization for SSE2 capable chips
• theora - Adds support for the Theora Video Compression Codec
• truetype - Adds support for FreeType and/or FreeType2 fonts
• v4l - Enable support for video4linux (using linux-headers or userspace libv4l libraries)
• v4l2 - Enable support for video4linux (DEPRECATED: Use USE v4l for your package to enable v4l2 or libv4l support)
• vorbis - Adds support for the OggVorbis audio codec
• X - Adds support for X11
• x264 - Enable h264 encoding using x264
• xml - Add support for XML files
• xvid - Adds support for xvid.org's open-source mpeg-4 codec