gstreamer1.0-plugins-base-doc 1.16.3-0ubuntu1.2 (armhf binary) in ubuntu focal

 GStreamer is a streaming media framework, based on graphs of filters
 which operate on media data. Applications using this library can do
 anything from real-time sound processing to playing videos, and just
 about anything else media-related. Its plugin-based architecture means
 that new data types or processing capabilities can be added simply by
 installing new plug-ins.
 .
 This package contains documentation for plugins from the "base" set,
 an essential exemplary set of elements.