Honored Contributor
Honored ContributorHello VGS,
Thank you very much for your reply! You hit the nail right on the head on both accounts! I really appreciate your input; I've been fighting with this issue for the past couple weeks, and today I finally got it all working. I triggered SignalTap on a type-0 packet, and sure enough the preceding control packet had all the expected correct information coming out of the deinterlacer and the clipper; and the control packet was the correct size. And you were right about the throughput issue creating the flickering. The input into the CVI block is 720x506, and the output of the CVO is 640x480...a lot more pixels coming in than going out, and the relatively small FIFO I had in the CVO wasn't big enough to compensate; the CVO was being starved of pixels to spit out to the screen. Unfortunately in my system I'm pretty memory limited, so it's going to prove difficult to add a frame buffer. Instead, I changed the deinterlacer to output frames at the input field rate instead of the input frame rate...that doubled the output rate, and as soon as I did that the video showed up solid as a rock. I'm now filling up the FIFO in the CVO, so I'm still going to have to figure out a way to instantiate a frame buffer, but this at least gets me something to show the boss and I think it proves that it is a throughput problem. Again, thanks for your prompt and insightful post! Take care.
