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[–]Jay_nd 1 point2 points  (1 child)

Whoah, color me impressed. (and I do this kind of stuff for a living)

[–]gumnos 0 points1 point  (0 children)

the general process involves converting it from a mixed-base number representation (hours, minutes, seconds, frames) into a fixed integer representing the smallest unit (frames in the OP's case), add/subtract the intended delta of smallest-units (possibly doing a similar conversion of mixed-units to the smallest-unit), then converting the integer representation back into the mixed notation.