R

reference clock
An object that provides a clock and supports the scheduling of events in the filter graph.
reference time
An absolute time established by a reference clock in the filter graph.
REFTIME
A floating-point value of type double that represents a number of seconds.
renderer
A filter that renders media data to some location, such as a computer monitor, a sound card, or a file.
retail build
The smallest and fastest type of build. Generally less robust than a debug build.