On Mar 25, 2008, at 08:50, Joseph Ayers wrote:
Tech Note 2138 http://developer.apple.com/technotes/tn2005/
tn2138.html states that this is AKA:
// ,,,dd:hh:mm:ss.ff/ts
which translates into:
days:hours:minutes:seconds:frames/timescale
But as I step through my movie the string that [movie currentTime]
returns is of the form
0:00:00:05.315/2997
0:00:00:05.415/2997 in consecutive frames
Continuing Stepping, I see transitions like
0:00:00:06.2918/2997
0:00:00:07.21/2997
0:00:00:07.121/2997 in consecutive frames
Is 315 in the first instance, the current frame, or 3? If its 3,
what is 15?
How do I translate this into a time in seconds?
The "/" here represents division, and the result is a time, not a
frame number.
Your movie is 29.97 fps, so the frames are 100/2997 seconds apart.
The frame after 5.315/2997 is 5.(315+100)/2997 or 5.415/2997. Since
2918+100 modulo 2997 is 21, the frame after 6.2918/2997 is 7.21/2997.
Notice that if the numbers increased by 125 instead of 100, the movie
would be playing at 2997/125 or 23.976 fps, another standard rate.
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