FFmpeg
Tools to process multimedia content such as audio, video, subtitles...
...Implements streaming protocols, container formats, and basic I/O access. Includes hashers, decompressors and miscellaneous utility functions. Provides means to alter decoded audio and video through a directed graph of connected filters. Provides an abstraction to access capture and playback devices. Implements audio mixing and resampling routines. Implements color conversion and scaling routines. FFmpeg is a command-line toolbox to manipulate, convert and stream multimedia content. ffplay is a minimalistic multimedia player. FFmpeg codebase is mainly LGPL-licensed with optional components licensed under GPL.