Hans Verkuil wrote:

> Mail the output, perhaps that will tell me something. Because I have no 
> idea whatsoever what could be causing the problems you have.

I have a theory based on observation of the problem: Most channels don't 
contain 
black, but sports and news broadcast often have narrow strips extending across 
the image, containing text against a back background.  I think this is being 
interpreted as horizontal blank period.  As the strip appears or disappears, 
the 
problem follows it.  In one case large black box in the center containing text, 
which caused vertical sync failure, suggesting that it was interpreted as a 
vertical blank period.

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