Extract pixel data from video stream

Hi,

there is no need to try to control or interact with the frame buffer. Everything should be automatic. You just need to tick the check boxes in the GUI to enable dropping and repeating of frames so that the frame buffer becomes a triple buffer.

The triple buffer behaviour is determined by what happens on the Avalon-ST wires. If the flow of valid pixels at the input is small and the output is always ready for data then the output side of the triple buffer will start repeating frame to meet the demand. On the contrary, when the output is slow, as in your case, you can apply back-pressure whenever is appropriate between pixels by setting ready low, the input side of the triple buffer will drop incoming frames to meet your output frame rate.

> can you give me some hints of how to access this data from the Avalon-ST

I believe you will have to build a bridge between the Avalon-ST Video output of the frame buffer and your device. The Avalon-ST Video protocol used by the Video IP is described in the user guide. This will describe how you can access image data, moderate the flow, ...