> From: "Pieter Laeremans"
> Sent: Saturday, June 11, 2005 11:58 PM
> Subject: Re: Frames per second
>
> > >> How can I determine the frames per second rate of a movie, or more
> > >> specifically the video track within a movie? I've figured out how
> > >> to get the time scale and the duration, but the rate eludes.
> > >> getRate() and getPreferredRate() seem to be relative numbers
> > >> rather than absolute numbers; i.e. they can speed up or slow down
> > >> a movie but they don't tell me how fast it normally plays.
> > >>
> > >>
> > >
> > > I think it's related to the TimeBase (combined with the Rate)
> > >
> >
> >
> > What works with the movie files I tried is in the code below:
> >
> >
> > the timeScale is obtianed by mov.getTimeScale(), but is initialized
> > prior
> >
> > Applying this to the videotrack didn't yield good results for every
> > movie type.
> >
> > notice that the myFlags changes. I don't know why I did it. But part
> > of this is inspired by looking at some piece of code in Chris
> > Adamsons book (which is great by the way).
> > Notice that I store each time
> >
> >
> > /**
> > * Calculates the frameRate and assigns it to the instance
> > variable frameRate
> > * also stores the duration of a frame to the instance variable
> > timeForOneFrame
> > * expressed in the timebase of the movie.
> > Requires: timeScale set to the timeScale of the movie
> > * @throws StdQTException
> > */
> > private void getFrameRate() throws StdQTException {
> > int myFlags = StdQTConstants.nextTimeEdgeOK
> > + StdQTConstants.nextTimeMediaSample;
> > TimeInfo myTime = new TimeInfo(0, 0);
> >
> > try {
> > Track theTrack = mov.getIndTrackType(1,
> > StdQTConstants.visualMediaCharacteristic,
> > StdQTConstants.movieTrackCharacteristic);
> > for (int i = 0; i < 3; i++) {
> > myTime = theTrack.getNextInterestingTime(myFlags,
> > myTime.time,
> > 1f);
> > myFlags = StdQTConstants.nextTimeStep;
> > if (i == 2) {
> > timeForOneFrame = myTime.duration;
> > frameRate = timeScale / myTime.duration;
> > }
> > }
> >
> > } catch (Exception e) {
> >
> > }
> > }
> >
> >
> >
> >
> > >
> > > -----
> > > George Birbilis (email@hidden)
> > > Microsoft Most Valuable Professional
> > > MVP J# for 2004 & 2005
> > > http://www.kagi.com/birbilis
> > > QuickTime, Delphi, ActiveX, .NET, IPC
> > > --------------
> >
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