[Ardour-Dev] Ardour Timecode

[John Emmas]

On 30 Oct 2012, at 16:56, Robin Gareus wrote:

> 
> Are you saying that 29.97 NDF == 30000/1001 but 29.97 DF == 29.97 ?
> 

No, I'm saying that the intention of dropframe timecode is to drop (precisely) 108 frames per hour from a source that hitherto ran at 30fps.

30 x 1000 / 1001 is not the right formula for achieving 108 dropped frames per hour.

30 x 999 / 1000 is the correct formula.

I don't use 29.97 NDF but as far as I can tell, 30 x 999 x 1000 would still be the correct pulldown formula.

I've never encountered 30000/1001 in my own timecode workings but as I say, I'm not in a region that uses dropframe or 29.97.

John