Interpreting [movie currentTime]

FROM : Joseph Ayers
DATE : Tue Mar 25 16:50:36 2008

I'm trying to determine the current frame, the total number of frames in
the movie a
and real time (in seconds from beginning of a movie using [movie
currentTime]

QTTime is defined as

typedef struct {
    long long        timeValue;
    long            timeScale;
    long            flags;
} QTTime;

with the comment:
// SMPTETime:

// hh:mm:ss:ff or hh:mm:ss;ff for drop frame

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?

Thanks,
Joseph Ayers

--
Joseph Ayers, Professor
Department of Biology and
Marine Science Center
Northeastern University
East Point, Nahant, MA 01908
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