Timecode Desk

Work out what every timecode on a reel actually names. Drop-frame drops no frames - not one frame of picture is ever discarded; it is a renaming scheme that skips two labels at the top of every minute except every tenth, so the labels keep up with a clock the nominal rate does not. Converts labels to frame numbers in exact integer arithmetic, computes durations that never come from subtracting digits that lie, catches labels that were never issued, treats the separator as the format declaration it is, and says how far the labels and the clock have come apart - 3.6 seconds an hour on non-drop, and 86 milliseconds a day FAST on drop-frame, which is not the zero it is usually credited with. Five lanes plan, check, duration, drift and deliver. The engine is free and runs in the browser.

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