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Old 11-01-10, 12:47 PM   #2
bwheaton
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Default Re: NVIDIA Quadro SDI sync detect incorrect

Yeah, oops. Can't speak to the SDI capture card specifically, but speaking from a video guy perspective, your 23.98 PsF *IS* 47.96i.

That's not the case with your other example - 23.98P versus 59.94i.

Not sure if that makes sense to you, but PsF is an interlaced signal that, by common agreement, is actually a set of progressive frames broken into fields.

As such, there is no way to tell them apart in a simple sync signal. In fact, that's sort of the point - the signal can pretend to be interlaced so that it can pass through an interlace friendly signal path.

I would expect an actual video signal might have a flag to indicate this signal type - have to look at the spec, i.e., it might be in the ancillary data.

Bruce
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