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Old 24th September 2015, 11:33   #1  |  Link
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Join Date: Aug 2008
Location: Isle of Man
Posts: 586
ShowSMPTE() drop-frame algorithms

I'm looking for the algorithms used to implement ShowSMPTE's drop-frame counting. It's help file covers NTSC TV, but none of the others:
Something similar holds also for the following framerates:
framerate range base-rate
[47.951, 47.953] 48
[59.939, 59.941] 60
[119.879, 119.881] 120
I've found some discussion of NTSC film rate and double NTSC film rate, but nothing that indicates what was eventually decided upon.

Any ideas how those were implemented?
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