VIP handling of Interlaced video

Yeah I'd be suspect of how the mixer is going to handle it. The video IP user guide indicates that the mixer will accept interlaced data but with the following disclaimer:

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Interlaced/Progressive: Progressive. Interlaced data is accepted but the offset from the top edge for each foreground layer has to be adapted in consequence.

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Here is what I would do in order of increasing time commitment.

1 - double-check that you are correctly enabling the individual foreground channels (I assume you are using a NIOS for this).

2 - I would try a test pattern other than colorbars for the background. Something with some horizontal content.

3 - simplify the design so that you only have one video input for the sake of test. Stay with this until you get it working.

4 - Signaltap the inputs to the mixer.

5 - Simulate the design.

Jake