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DM365: interrupt but no output from resizer

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Hi,

I have the DM365 resizer working fine resizing frames of incoming video from a camera (parallel input).  But I can't get it to resize a single image (one-shot) that's coming from SDRAM.

I get an interrupt from the resizer saying it's finished, but the output buffer is empty.  What would cause the resizer not to output anything?

I have gone through all of the IPIPE I/F and Resizer registers, and double and triple checked my settings.  Everything looks fine to me:  source address, output address, one-shot mode, input image format , input from SDRAM instead of parallel input, etc etc.

I'm out of ideas.  What am I missing? Please help.