FFmpeg

FFmpeg is a command-line tool and set of libraries that can decode, encode, transcode, mux, demux, stream, filter, and play nearly every audio and video format in existence, and it quietly powers the media handling inside a huge share of the internet's video infrastructure, browsers, and media tools. Its licensing is nuanced: the core is LGPL, while enabling certain optional codecs shifts a given build to GPL.

FFmpeg is a fit for any team that needs to process, convert, or stream media programmatically, complementing Video.js and Jellyfin (also in this catalog) - those play and manage media, while FFmpeg does the underlying encoding and transcoding work.