H.264/HEVC/VP9/VP8 and AAC/Opus/Vorbis out of MP4 and Matroska, via FFmpeg. The native payload is the limn-ffmpeg-natives artifact, versioned with FFmpeg: this module brings its JNI shim along, and an application adds one natives-<os>-<arch> classifier of it (macOS, Linux, Windows; x86_64, aarch64; LGPL-2.1-or-later, see NOTICE-ffmpeg.txt in those jars) or limn-video-ffmpeg-natives-all. Without one the decoder reports itself unavailable and the rest of the toolkit is unaffected.