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Hi all,
I have design a video data path through clipper and scaler II: CVI 1080P-> clipper -> scaler II 1080P -> CVO 1080P the output resolution of the scaler II is set to 1920x1080. the data path is working when the output of the clipper is Hx1080, the range of H is from 10 to 1920. but once I change the the vertical pixel number, there is no output from the CVO. I have read some posts here, one mentioned that I should add a frame buffer between the clipper and the scaler II. But in the design example an427 from altera, there is no buffer between the clipper and scaler II. I doubt that it is necessary to add a frame buffer. the clocked video clock is 74.25 MHz and the avalon ST clock is 148.5 MHz Thanks for your assistance! Best Regards, DanielLink Copied
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Add a frame buffer after the scalar, and overlay the output on a background.

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