A multimedia playback framework based on Qt and FFmpeg to write a player easily. [LGPL] website

A library for reading and editing the metadata of several popular audio formats. [LGPL/MPL] website

A collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata. [LGPL v2.1+ and others] website

Portable subtitle renderer for the ASS/SSA subtitle format. [ISC]

Convenient unified display of the most relevant technical and tag data for video and audio files. [BSD]

Multimedia streaming library using open standard protocols (RTP/RTCP, RTSP, SIP). [LGPL]

libVLC (VLC SDK) media framework. [GPL]