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the frame has already gone by. Practical real-time timecode decoders use a "flywheel" algorithm follows the ascending sequence of timecodes, and infer the time of the current frame from that, something which is also useful to skip over bit errors or dropouts in the timecode stream. However, this requires a series of good timecodes to establish the ascending sequence in the first place, and thus a boundary between discontinuous timecode ranges cannot be determined by this algorithm until several subsequent frames have passed. This restriction

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