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.
What am I missing?
Jonathan del Strother
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