GStreamer is an open source multimedia framework for creating audio and video applications. It allows for streaming audio, video and other multimedia content over a network and allows developers to create custom applications for audio and video playback and manipulation. GStreamer supports a wide range of media formats, including popular formats such as MP3, AAC, Ogg Vorbis, and FLAC. It also supports video playback and manipulation, including encoding and decoding of popular formats such as H.264, MPEG-4, and many more. GStreamer also supports hardware accelerated video and audio processing, as well as a variety of plug-ins that enable developers to quickly and easily add powerful features to their applications. GStreamer is highly portable and can be used on a variety of platforms, including Windows, Linux, OS X, Android and iOS.
GStreamer is a library, not just a package with utilities or similar.