[Ardour-Dev] Ardour Timecode

John Emmas johne53 at tiscali.co.uk
Thu Nov 1 14:45:36 PDT 2012

On 1 Nov 2012, at 20:59, Robin Gareus wrote:

> the 3.6ms error / hour is for NTSC's 29.97fps (30/1.001) and not for 30fps.

Agreed Robin - but if you do the calculations, that 3.6mS error occurs because (regardless of what the timecode says) the actual number of frames being dropped per hour is 107.8921 (the timecode value says 108 because 108 is the nearest integer - but in reality, 108 frames are getting dropped every 1.001 hours).  That's the only way there can be a 3.6mS error.

It beggars belief that the NTSC committee chose a fraction of 1000/1001 when 999/1000 would have eliminated the error.  I find that really strange....


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