Quick question: Can we be sure that ofVideoGrabber in Ofelia will run at the window's frame rate? Or is it likely to be slower?

This is relevant for motion detection by frame difference: We need to be sure the difference is calculated once per camera frame, not per window frame.

hjh

I asked on the Open Frameworks forum, and the answer is: "To know if a new frame is available, there is a method called isFrameNew https://openframeworks.cc/documentation/video/ofVideoPlayer/." So that's simple enough.

The next problem, then, is: Lua is too slow for pixel-by-pixel analysis. Shaders seem not intended for analysis. The openCv add-on contains functions for blob analysis but I would be responsible for adding the Lua bindings and building Ofelia by myself for 3 platforms (https://github.com/cuinjune/Ofelia/issues/52) -- so currently Ofelia is not a good choice for camera-based control. I guess I'll have to try building it later, then... at least I don't need it until next semester.

hjh