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Topic: BVideo rewind/fast-forwarding? (Read 416 times) |
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saito
 
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BVideo rewind/fast-forwarding?
« on: Oct 29th, 2003, 9:10pm » |
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Hello.
Could somebody tell me how to play BVideo object from a certain frame?
BSound seems to have a similar function.
Is it simply not supported yet? Or, is there any unofficial way to do that?
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-SAITO / tatsuyas@ucla.edu
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REAS
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Re: BVideo rewind/fast-forwarding?
« Reply #1 on: Oct 30th, 2003, 8:27pm » |
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to my knowlege, it hasn't been written yet. i'll ask hernando...
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hbarragan
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Re: BVideo rewind/fast-forwarding?
« Reply #2 on: Oct 30th, 2003, 9:23pm » |
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Actually is not available in the video API, and as BVideo is based on Quicktime Movie object it doesn't provide a method to position at a determinated frame. The concept of frame is kind of abstract in this context, the movie is not stored a series of frames, for instance you may loss frames while playing a movie, even more when the movie is being loaded from a file or from the net the system doesn't know the size of it until it is fully loaded. It gets enough of it to know basic things like the frame size (frame width and height) while downloading.
The display of a movie is happening as a capturing (snapshot) of a playing movie. so a frame is captured from the movie at certain rate, but how many frames available? you can't know.
Going deeper into it, the positioning could be made through the Quicktime movie controller, but then the movie will be a kind of encapsulated object (with the traditional QT controls: play, stop etc.), and will not be presented as it is now, (series of images one after another) with control on every single captured frame. With the movie controller it is possible to access the time scale and then it is possible to position the playhead at a certain time, but not at an specific frame.
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