## U

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 a variety of purposes such as identifying shot and take numbers, calendar date, client code, or any other 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. This information is used to generate negative cut lists, so a theatrical film can be edited electronically.

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