However, the savings are often negligible (~100k cycles is a typical number) especially when amortized over the entire encoding/decoding operation. It enables savings in table generation time, done once at codec initialization, since by hardcoding the tables, they do not need to be computed at runtime. It results in an increase of approximately 15% in the size of libavcodec, the main library impacted by this change. Use pre-calculated tables rather than calculating them on the fly.
Should be enabled unless you require LGPL binaries.Īdd support for the gsm lossy speech compression codec Prefer net-libs/gnutls as SSL/TLS provider (ineffective with USE=-ssl)īuild GPL code. Support for configuring and customizing font access via media-libs/fontconfigĮnables fribidi support in the drawtext filter.Įnables gcrypt support: Needed for rtmp(t)e support if openssl, librtmp or gmp is not used.Įnables support for media-libs/game-music-emu for playing various video game music formats.Īdd support for dev-libs/gmp (GNU MP library) Use external fdk-aac library for AAC encodingĪdds a text-to-speech filter based on app-accessibility/flite. It is recommended to enable per package instead of globallyĪdd support for encoding of audio or video files If you want to get meaningful backtraces see Īdd extra documentation (API, Javadoc, etc). Mostly used for specific filters.Įnables AV1 decoding via media-libs/dav1d.Įnable extra debug codepaths, like asserts and extra output. Add support for media-libs/alsa-lib (Advanced Linux Sound Architecture)Įnables support for AMD's Advanced Media Framework (AMF)Įnables Adaptive Multi-Rate Audio supportĮnables Adaptive Multi-Rate Audio encoding support with media-libs/vo-amrwbenc.Įnables media-libs/libbs2b based Bauer stereo-to-binaural filter.Įnables audio CD grabbing with dev-libs/libcdio.Įnables audio fingerprinting support with media-libs/chromaprint.īuilds libffmpeg.so to enable media playback in Chromium-based browsers like Opera and Vivaldi.Įnables codec2 low bit rate speech codec support via media-libs/codec2.Įnables runtime CPU detection (useful for bindist, compatibility on other CPUs)Įnables CUDA-based acceleration.
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