gstreamer/docs/random/design

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The fundamental component of GStreamer is the "element", an object that
sources and/or sinks data. Elements are connected to each other via
"pads", which are extremely light-weight generic connections. Elements
can be contained inside "bins", which themselves are elements.
A pipeline consists of any number of elements, connected to each other one
after another. A source would connect to one end of a decoder, which in
turn would be connected (on the other end) to a sink, such as a sound
card. Other elements can be located anywhere in the pipeline, including
tees and transcoders.