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USE flags

• a52 - Enable support for decoding ATSC A/52 streams used in DVD
• aac - Enable support for MPEG-4 AAC Audio
• alsa - Add support for media-libs/alsa-lib (Advanced Linux Sound Architecture)
• cpu_flags_ppc_altivec - Use the AltiVec/VMX instruction set
• cpu_flags_x86_3dnow - Use the 3DNow! instruction set
• cpu_flags_x86_mmx - Use the MMX instruction set
• cpu_flags_x86_sse - Use the SSE instruction set
• cpu_flags_x86_sse2 - Use the SSE2 instruction set
• dv - Enable support for a codec used by many camcorders
• dvd - Add support for DVDs
• iconv - Enable support for the iconv character set conversion library
• imagemagick - Enable optional support for the ImageMagick or GraphicsMagick image converter
• jpeg - Add JPEG image support
• lzo - Enable support for lzo compression
• mp3 - Add support for reading mp3 files
• mpeg - Add libmpeg3 support to various packages
• ogg - Add support for the Ogg container format (commonly used by Vorbis, Theora and flac)
• oss - Add support for OSS (Open Sound System)
• quicktime - Add support for OpenQuickTime
• sdl - Add support for Simple Direct Layer (media library)
• theora - Add support for the Theora Video Compression Codec
• 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
• X - Add support for X11
• x264 - Enable h264 encoding using x264
• xml - Add support for XML files
• xvid - Add support for xvid.org's open-source mpeg-4 codec