SMPTE-Timecode
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The duration of a video clip as well as its first and last pictures are measured by a time code.
With this method each frame of a video tape can be identified, in order to have a check for the processing.
With the time code you are able to assin each frame a unique position and synchonice audio and video.
The SMPTE (Society of Motion Picture and Television Engineers) time code identifies each frame with a unique address in hours, minutes, seconds and frames.
A clip with a duration of 00:03:23|07 has a playing time of 3 minutes, 23 seconds, and 7 frames.