ffmpeg

USE flags

• 3dnow - Use the 3DNow! instruction set
• aac - Enable support for MPEG-4 AAC Audio
• abi_mips_n32 - 64-bit (32-bit pointer) libraries
• abi_mips_n64 - 64-bit libraries
• abi_mips_o32 - 32-bit libraries
• abi_ppc_32 - 32-bit (ppc) libraries
• abi_ppc_64 - 64-bit (ppc64) libraries
• abi_riscv_lp64 - 64-bit (rv64) soft-float libraries
• abi_riscv_lp64d - 64-bit (rv64) double hard-float libraries
• abi_s390_32 - 32-bit (s390) libraries
• abi_s390_64 - 64-bit (s390x) libraries
• abi_x86_32 - 32-bit (x86) libraries
• abi_x86_64 - 64-bit (amd64) libraries
• abi_x86_x32 - x32 ABI libraries
• 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
• amrenc - Enables Adaptive Multi-Rate Audio encoding support with media-libs/vo-amrwbenc.
• appkit - Enables Apple AppKit framework
• bluray - Enable playback of Blu-ray filesystems
• bs2b - Enables media-libs/libbs2b based Bauer stereo-to-binaural filter.
• bzip2 - Use the bzlib compression library
• cdio - Enables audio CD grabbing with dev-libs/libcdio.
• chromaprint - Enables audio fingerprinting support with media-libs/chromaprint.
• chromium - Builds libffmpeg.so to enable media playback in Chromium-based browsers like Opera and Vivaldi.
• codec2 - Enables codec2 low bit rate speech codec support via media-libs/codec2.
• cpu_flags_arm_neon - Use the NEON (ASIMD) instruction set
• cpu_flags_arm_thumb - Enable Thumb instruction set (ARMv*T and ARMv6+)
• cpu_flags_arm_thumb2 - Enable Thumb-2 instruction set (ARMv*T2 and ARMv7+)
• cpu_flags_arm_v6 - Use instructions added in ARMv6
• cpu_flags_arm_v8 - Use instructions added in ARMv8
• cpu_flags_arm_vfp - Use the VFP version 2 instruction set
• cpu_flags_arm_vfpv3 - Use the VFP version 3 instruction set
• cpu_flags_x86_3dnow - Use the 3DNow! instruction set
• cpu_flags_x86_3dnowext - Use the Enhanced 3DNow! instruction set
• cpu_flags_x86_aes - Enable support for Intel's AES instruction set (AES-NI)
• cpu_flags_x86_avx - Adds support for Advanced Vector Extensions instructions
• cpu_flags_x86_avx2 - Adds support for Advanced Vector Extensions 2 instructions
• cpu_flags_x86_fma3 - Use the Fused Multiply Add 3 instruction set ([fma] in cpuinfo)
• cpu_flags_x86_fma4 - Use the Fused Multiply Add 4 instruction set
• cpu_flags_x86_mmx - Use the MMX instruction set
• cpu_flags_x86_mmxext - Use the Extended MMX instruction set (a subset of SSE) ([mmxext] or [sse] in cpuinfo)
• cpu_flags_x86_sse - Use the SSE instruction set
• cpu_flags_x86_sse2 - Use the SSE2 instruction set
• cpu_flags_x86_sse3 - Use the SSE3 instruction set ([pni] in cpuinfo, NOT ssse3)
• cpu_flags_x86_sse4_1 - Enable SSE4.1 instruction support
• cpu_flags_x86_sse4_2 - Enable SSE4.2 instruction support
• cpu_flags_x86_ssse3 - Use the SSSE3 instruction set (NOT sse3/pni)
• cpu_flags_x86_xop - Enable the XOP instruction set
• cpudetection - Enables runtime CPU detection (useful for bindist, compatibility on other CPUs)
• cuda - Enables CUDA-based acceleration. Mostly used for specific filters.
• custom-cflags - Build with user-specified CFLAGS (unsupported)
• dav1d - Enables AV1 decoding via media-libs/dav1d.
• debug - Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see https://wiki.gentoo.org/wiki/Project:Quality_Assurance/Backtraces
• 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
• examples - Install examples, usually source code
• fdk - Use external fdk-aac library for AAC encoding
• 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_ffescape - Escapes an input string, adopting the av_get_token() escaping logic.
• fftools_ffeval - A simple expression evalutor.
• fftools_ffhash - Computes a file's digest using libavutil algorithms.
• fftools_fourcc2pixfmt - Shows the relationships between rawvideo pixel formats and FourCC tags.
• 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_sidxindex - Write an MPD file for fragmented MP4 files with a sidx index at the start of the file.
• fftools_trasher - Writes burts of random data into a file. Great for testing error robustness/resilience/concealment.
• flite - Adds a text-to-speech filter based on app-accessibility/flite.
• fontconfig - Support for configuring and customizing font access via media-libs/fontconfig
• frei0r - Enable frei0r wrapping in libavfilter
• fribidi - Enables fribidi support in the drawtext filter.
• gcrypt - Enables gcrypt support: Needed for rtmp(t)e support if openssl, librtmp or gmp is not used.
• gme - Enables support for media-libs/game-music-emu for playing various video game music formats.
• gmp - Add support for dev-libs/gmp (GNU MP library)
• gnutls - Prefer net-libs/gnutls as SSL/TLS provider (ineffective with USE=-ssl)
• gpl - Build GPL code. Should be enabled unless you require LGPL binaries.
• gsm - Add support for the gsm lossy speech compression codec
• hardcoded-tables - Use pre-calculated tables rather than calculating them on the fly.
• iconv - Enable support for the iconv character set conversion library
• iec61883 - Support for FireWire DV/HDV input device using media-libs/libiec61883.
• ieee1394 - Enable FireWire/iLink IEEE1394 support (dv, camera, ...)
• ipv6 - Add support for IP version 6
• iwmmxt - Add support for optimizations for ARM iwMMXt instructions
• jack - Add support for the JACK Audio Connection Kit
• jpeg2k - Support for JPEG 2000, a wavelet-based image compression format
• kvazaar - Enables media-libs/kvazaar based HEVC encoder.
• ladspa - Enable the ability to support ladspa plugins
• libaom - Enables media-libs/libaom based AV1 codec support.
• libaribb24 - Enables ARIB text and caption decoding via media-libs/aribb24.
• libass - SRT/SSA/ASS (SubRip / SubStation Alpha) subtitle support
• libcaca - Add support for colored ASCII-art graphics
• libdrm - Enables x11-libs/libdrm support for better screen grabbing and hardware accelerated codecs.
• libilbc - Enables iLBC de/encoding via media-libs/libilbc.
• libressl - Use dev-libs/libressl instead of dev-libs/openssl when applicable (see also the ssl useflag)
• librtmp - Enables Real Time Messaging Protocol using librtmp (media-video/rtmpdump) in addition to FFmpeg's native implementation.
• libsoxr - Enables audio resampling through media-libs/soxr.
• libtesseract - Enables the OCR filter via app-text/tesseract.
• libv4l - Uses media-libs/libv4l for video4linux instead of direct calls. Adds support for more devices via the userspace library.
• libxml2 - Uses dev-libs/libxml2 to enable dash demuxing support.
• lv2 - Enables lv2 audio filter wrapper.
• lzma - Support for LZMA (de)compression algorithm
• mipsdspr1 - Enables MIPS DSP ASE R1 optimizations.
• mipsdspr2 - Enables MIPS DSP ASE R2 optimizations.
• mipsfpu - Enables floating point MIPS optimizations.
• mmal - Enables Multi-Media Abstraction Layer (MMAL) decoding support: Available e.g. on the Raspberry Pi.
• 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
• nvenc - Adds support for NVIDIA Encoder (NVENC) API for hardware accelerated encoding on NVIDIA cards.
• openal - Add support for the Open Audio Library
• opencl - Enable OpenCL support
• opengl - Add support for OpenGL (3D graphics)
• openh264 - Enables H.264 encoding suppoprt via media-libs/openh264.
• openssl - Enables dev-libs/openssl support. Adds support for encrypted network protocols (TLS/HTTPS).
• opus - Enable Opus audio codec support
• oss - Add support for OSS (Open Sound System)
• pic - Force shared libraries to be built as PIC (this is slower)
• postproc - Build and install libpostproc.
• pulseaudio - Add support for PulseAudio sound server
• rubberband - Adds time-stretching and pitch-shifting audio filter based on media-libs/rubberband.
• samba - Add support for SAMBA (Windows File and Printer sharing)
• sdl - Add support for Simple Direct Layer (media library)
• snappy - Enable app-arch/snappy support. Required for e.g. Vidvox Hap encoder.
• speex - Add support for the speex audio codec (used for speech)
• srt - Enable support for Secure Reliable Transport (SRT) via net-libs/srt
• sse - Use the SSE instruction set
• sse2 - Use the SSE2 instruction set
• sse3 - Use the SSE3 instruction set (pni in cpuinfo)
• ssh - Enable SSH/sftp support via net-libs/libssh.
• static-libs - Build static versions of dynamic libraries as well
• svg - Add support for SVG (Scalable Vector Graphics)
• 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
• twolame - Enables MP2 encoding via media-sound/twolame as an alternative to the internal encoder.
• 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)
• vaapi - Enable Video Acceleration API for hardware decoding
• vdpau - Enable the Video Decode and Presentation API for Unix acceleration interface
• video_cards_nvidia - VIDEO_CARDS setting to build driver for nvidia video cards
• vidstab - Enables video stabilization filter using vid.stab library (media-libs/vidstab).
• vorbis - Add support for the OggVorbis audio codec
• vpx - 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.
• wavpack - Add support for wavpack audio compression tools
• webp - Add support for the WebP image format
• X - Add support for X11
• x264 - Enable h264 encoding using x264
• x265 - Enables HEVC encoding with media-libs/x265.
• xcb - Support the X C-language Binding, a replacement for Xlib
• xvid - Add support for xvid.org's open-source mpeg-4 codec
• zeromq - Enables net-libs/zeromq support with the zmq/azmq filters.
• zimg - Enables media-libs/zimg based scale filter.
• zlib - Add support for zlib (de)compression
• zvbi - Enables media-libs/zvbi based teletext decoder.

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