On Tue, Jun 3, 2008 at 7:27 PM, Jonathan del Strother
<email@hidden> wrote:
> I'm using QTCaptureDecompressedVideoOutput to capture frames from a
> webcam, and store them as a movie.
>
> I'm seeing some odd timing values in the QTSampleBuffer that you get
> in captureOutput:didOutputVideoFrame:withSampleBuffer:fromConnection:.
> The timeScale is always 30000, on both internal & external isights.
> However :
>
> On an MacPro or iMac using an external iSight, over the course of 1
> second, (presentationTime/timeScale) increases by 1.0, as expected.
> On an iMac with builtin iSight, over the course of 1 second,
> (presentationTime/timeScale) increases by 0.666.
>
> That is, if I capture 1 minute's worth of video frames from this, the
> resulting movie from an external iSight will run for 1 minute. No
> surprise there. However - 1 minute from an internal iSight will be
> sped up, and only last for 40 seconds.
I'm still struggling with this. A reboot seems to fix the problem, at
least until it decides to pop up again.
No ideas, anyone?
Jon
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