Why do I see what appears to be random glitches or flickering for several frames each second in video output from the Video Scaler?
This is a known issue discovered in v7.01.a of the Video Scaler. The problem is that the last line of a frame is repeated for every line of the next frame. This will happen randomly, causing flickering to occur in the output video.
This issue is fixed in the:
For a detailed list of LogiCORE IP Video Scaler Release Notes and Known Issues, see (Xilinx Answer 31958).
For a detailed list of LogiCORE IP Video Scaler Release Notes and Known Issues for Vivado Design Suite 2013.1 or later, see (Xilinx Answer 54540).