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Error: Failed to detect video standard, video input connected?

I can't get the encodedecode demo to run, and it returns the following errors:

> Encodedecode demo started

> Error: Failed to detect video standard, video input connected?

Is there a way to check that the input signal I use is of the right standard, or what else could be wrong?  I'm using a video signal generator to generate the test signal, and am using PAL standard.  My bootargs are setup for videostd=pal.  Is there somewhere else that I need to set it up as PAL?