SlackBuildsOrg/multimedia/gpac

GPAC is an open-source multimedia framework focused on modularity and
standards compliance. GPAC provides tools to process, inspect, package,
stream, playback and interact with media content. Such content can be
any combination of audio, video, subtitles, metadata, scalable
graphics, encrypted media, 2D/3D graphics and ECMAScript.

GPAC is best-known for its wide MP4/ISOBMFF capabilities and is popular
among video enthusiasts, academic researchers, standardization bodies,
and professional broadcasters.

GPAC also features MP4Box, a multimedia swiss-army knife.

Optional dependencies available on SBo: faad2, xvidcore, jack

Optional dependencies not yet available on SBo: openhevc, freenect,
opensvcdecoder, platinumupnp