[ardour-dev] Timecode computation error

[Fons Adriaensen]

On Thu, Nov 16, 2006 at 01:40:13PM +0000, Chris Goddard wrote:

> When selecting 25fps I would expect the timecode to count 25 frames per 
> second, i.e. 0 -> 24.
> 
> If I select 24.976 I would expect the frame count to be 25 frames per second 
> again (0 -> 24) but just running slightly slower.

Running 1/1000 slower and skipping the first two frames of every minute 
except when minutes is a multiple of 10, to keep average speed of time
correct. 

The non-integer rates are always 'drop frame' variants of the nearest
integer rate, they don't make sense otherwise. They should indeed count
up to corresponding integer rate minus one, but occasionally wrap to 
2 instead of 0.

So for 30 fps DF, the frame following 00:00:59:29 is 00:01:00:02.
The real frame rate is then 29.97 fps. 


-- 
FA

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