video media-video@gentoo.org Enable manually-optimised routines using the AMD 3DNow!Ex SIMD instruction set, present in modern AMD CPUs. (Check for 3dnowext in /proc/cpuinfo to know whether your CPU supports it). AAC+ encoding via media-libs/libaacplus. Enables Adaptive Multi-Rate Audio support Enables libavresample, media-video/libav version of libswresample (which installed and makes libavresample redundant): A conversion library between uncompressed audio formats. Adds support for Advanced Vector Extensions instructions (Intel Sandy Bridge, AMD Bulldozer and later chips) Enforces license compatibility constraints via REQUIRED_USE. Enable playback of Blu-ray filesystems Enables audio CD grabbing with dev-libs/libcdio. Adds Xiph CELT audio decoding support via media-libs/celt Enables runtime CPU detection (useful for bindist, compatibility on other CPUs) Enable Dirac video support (an advanced royalty-free video compression format) via the reference library: dirac. Use external faac library for AAC encoding Use external fdk-aac library for AAC encoding Adds a text-to-speech filter based on app-accessibility/flite. Enable frei0r wrapping in libavfilter Use pre-calculated tables rather than calculating them on the fly. Support for FireWire DV/HDV input device using media-libs/libiec61883. Uses media-libs/libv4l for video4linux instead of direct calls. Adds support for more devices via the userspace library. Enables mmx2 support Enables network streaming support Enables dev-libs/openssl support. Adds support for encrypted network protocols (TLS/HTTPS). Adds (decoding) support for the Opus codec via media-libs/opus. Force shared libraries to be built as PIC (this is slower) Enable Real Time Messaging Protocol using librtmp Enable Dirac video support (an advanced royalty-free video compression format) via libschroedinger (high-speed implementation in C of the Dirac codec). Faster floating point optimization for SSSE3 capable chips (Intel Core 2 and later chips) Enables MP2 encoding via media-sound/twolame as an alternative to the internal encoder. Enables VAAPI (Video Acceleration API) for hardware decoding Adds support for SIMD optimizations for UltraSPARC processors. Enables vp8 codec support using libvpx: Decoding vp8 does not require this to be enabled but libvpx can also be used for decoding; encoding vp8 requires this useflag to be enabled though.