gstreamer Elements

capsfilter - pass data though unmodified, but enforces format limmits
fakesrc - Generate (meaningless) buffers
fakesink - black hole for data
fdsink - write to a unix file descriptor
fdsrc - read from a unix file descriptor
filesrc - read from arbitrary point in a file
filesink - write stream to a file
identity - pass data through without modification
queue - Simple asynchronous data queue.
tee - 1-to-N pipe fitting
typefind - Finds the media type of a stream