U

upsample
Increase the number of samples or pixels, by applying an operation such as interpolation.
upstream filter
The filter that passes data from its output pin to the connected input pin of the next filter in the filter graph.
URL moniker filter
A source filter that reads from an Internet server.
userbits
Undefined bits in the SMPTE timecode. These bits can be used for any information the user wants to encode, so that it travels with the source material throughout the post-production process. Often, userbits contain original film and audio tape information.