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MLT is an open source multimedia framework, designed and developed for television broadcasting. It provides a toolkit for broadcasters, video editors, media players, transcoders, web streamers and many more types of applications. The functionality of the system is provided via an assortment of ready to use tools, XML authoring components, and an extensible plug-in based API.

Buzztard gstreamer plugins

Libav provides cross-platform tools and libraries to convert, manipulate and stream a wide range of multimedia formats and protocols. It originates from the FFmpeg codebase, but goes its own way these days, providing its users with reliable releases and a clear vision how to go forward.

MPlayer is a multimedia player and encoder suite which runs on many platforms. It plays a terrific number of different file formats and codecs including popular DivX, XviD, H.264 streams as well as DVD and SVCDs along with many popular audio codecs. On the i386 platform it also supports some Windows DLL codec families which allow playing of e.g. QuickTime movies.

The goals for Open Cinema Tools are: * Creation of DCP from source files * Support for multi-reel DCPs with several audio and subtitle tracks

MPlayer-based thumbnail generator for video files.

libde265 is an open source implementation of the h.265 video codec. It is written from scratch and has a plain C API to enable a simple integration into other software. libde265 supports WPP and tile-based multithreading and includes SSE optimizations. The decoder includes all features of the Main profile and correctly decodes almost all conformance streams.

The Aegisub Project is a community-driven effort to write the BSDL licensed cross-platform subtitle editor Aegisub. Composed completely of volunteers passionate about subtitling, as a project it strives to be open, fair and most of all: free.

[ excerpt from developer's site ] matroska is a project aiming to become the standard of Multimedia Container Formats one day. It was derived from a similar project called MCF, but differentiates from that significantly because it is based on EBML (Extensible Binary Meta Language ), a kind of binary version of XML. This way the development team gains significant advantages in terms of future format extensability, without breaking file support in old parsers. Advanced because it is based on EBML, a kind of XML equivalent, that allow infinite extensibility of the format. And full featured because it includes precise seeking, any audio/video/subtitle codec support including VCM/ACM/DirectShow compatibility, timecode based format, complex frame dependencies, chaptering, internationalisation, error protection, tagging, file attachement, control track (to be defined), menu (to be defined), etc. All these features are not yet implemented but already defined in the format.

Kdenlive is a non-linear video editor for GNU/Linux, OS X and FreeBSD, which supports DV, AVCHD and HDV editing. Kdenlive relies on several other open source projects, such as FFmpeg, the MLT video framework and Frei0r effects. It was designed to answer all needs, from basic video editing to semi-professional work.