videoinput disk logging skipping every other frame

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Hi there--

I'm logging webcam data to disk using videoinput from Image Acq Toolbox.

My webcam is set to 30 fps (verified in Matlab) and when logging to memory, it manages to obtain every frame. However, when logging to disk, I am getting exactly half as many frames as I would expect given the time. This occurs both with 'disk' and 'disk&memory' logging. I'm on a powerful i7 with plenty of memory and fast hard drives, obtaining only at 352x288 resolution, and at the moment nothing else is running. It occurs whether I have a preview on or not. Any guesses?

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kumaran B 2012-9-4

Before closing the avifile object, make sure that the DiskLoggerFrameCount property of the videoinput object is equal to the FramesAcquired property. The DiskLoggerFrameCount property tells you how many frames have been written to disk. You could use code like:

whie (vidobj.DiskLoggerFrameCount ~= vidobj.FramesAcquired) pause(1); end aviobj = close(vidobj.DiskLogger);

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