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I have the FIDOUT configured for Data Enable, with about HFP = HBP = 20px or so.
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The "or so" part doesn't sound very confident. You list different horizontal porch values in your original post. Unless you have a frame buffer, the input and output video timings must be perfectly synchronous with each other or else you will have problems.
What else is in your chain when testing the clocked video input? Have you tried using just clocked video in and clocked video out both using the same 50Mhz video clock?
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4) In general there is no mention of the clock ratios needed in the SOPC blocks, are they all single cycle blocks? Where can I find this literature?
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Try looking in the section "Stall Behavior".
Honored Contributor
