gstreamer Elements

capsfilter — Pass data without modification, limiting formats
fakesrc — Push empty (no data) buffers around
fakesink — Black hole for data
fdsink — Write data to a file descriptor
fdsrc — Read from a file descriptor
filesrc — Read from arbitrary point in a file
filesink — Write stream to a file
identity — Pass data without modification
multiqueue — Multiple data queue
queue — Simple data queue
tee — 1-to-N pipe fitting
typefind — Finds the media type of a stream