- HDAlteration of timecode to match the framerate of NTSC video to a time of day clock. NTSC video actually runs at 29.97 frames per second (30\/1.001). To keep the timecode on an NTSC videotape synchronous with a time of day clock, it needs to make up 1 in 1001 frames. It does this by changing the count by two frames on nine out of every ten minutes. So the frame following 10:35:59:29 would be numbered as 10:36:00:02. 30 frame HD formats are often run at 29.97 to allow conversion and synchronization to NTSC video. These formats support Drop-Frame timecode. Note that there is no drop frame format for native 24-frame video formats. Also see Non-Drop-Frame, Timecode.
Audio and video glossary. 2014.
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Drop Frame — F/A/V American system of time code generation that adjusts the generated data every minute to compensate for the spread of the NTSC television system running at 29.97 frames per second … Audio and video glossary
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Drop-frame timecode — PP Timecode that is modified to remain in sync when 29.97 fps NTSC video is broadcast at 30 fps. In order to retain accuracy, the first two timecode frames of every minute are dropped, with the exception of every tenth minute. Note that only the… … Audio and video glossary
Non-Drop-Frame — HD Timecode counting scheme that always counts 30 frames in a second. Because NTSC video operates at 29.97 frames per second, the counting timecode will not match the time of day. Since there is no drop frame format for native 24P, it is not… … Audio and video glossary
Non-drop frame timecode (NDF) — PP Timecode that counts every frame and does not compensate for the innacuracies that occur when 29.97 fps is converted to 30 for NTSC broadcast. See also drop frame timecode … Audio and video glossary
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