Timecode Descriptions
Decribing what Drop-Frame Timecode is is not easy,
here is a selection of various attempts:
Timecode Calculators
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TCplus - a Macintosh timecode calculator application
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EditCalc - timecode calculator app for the iPhone and iPod Touch
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pTCcalc - online timecode calculator
Timecode Libraries
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EPEIOS timecode manager - C++ timecode library, depends upon EPEIOS environment