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In order to align all of your images to keep you mixer happy, you will have to delay the readout of each frame buffer to the one that will be the last to arrive. In your case, the clipper for the lower right image.
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Hi mess,
until yesterday, I thought that my pictures are delayed only horizontal and so I delayed all other streams till they are on the position of the last one.
But I have done this with onchip FIFOs.
And now, when I see that I have a vertical delay, my onchip memory for the FIFOs is much to small to do this job. =(