Re: QuickTime movie frame rate or duration (in time scale) of a frame
Re: QuickTime movie frame rate or duration (in time scale) of a frame
- Subject: Re: QuickTime movie frame rate or duration (in time scale) of a frame
- From: Brennan <email@hidden>
- Date: Wed, 20 Feb 2002 10:51:53 +0100
Roger Howard <email@hidden> wrote
>
I need to calculate the duration (in time scale units) of a single frame of
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a video track in a Quicktime movie... This would seem to be a very simple
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task, simply divide the movie's "time scale" value by the video track's
>
frame rate, which would give the duration of a single frame.
>
>
The only problem is that I cannot find a property for "frame rate" of any
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object in the Quicktime Player object model... Nor can I find any other
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property (or properties) with which I could calculate that value.
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>
Can anyone help, or is this is a known limitation of the object model??
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Seems like a glaring omission at best, so I remain hopeful I'm missing
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something.
In the movie class you'll find 'preferred rate'. Would that do you?
Even easier, just look in the frame class - there's a duration property!
tell app "Quicktime Player"
tell movie 1
tell track 1
get (duration of frame 1)
end tell
end tell
end tell
n.b. Individual frames can have different durations, but if you are certain that the frames all have the same duration, then checking an arbitrary frame would be ok.
Brennan
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