- 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.