@rasp, So I assume you modified the cpp as above and recompiled to make it faster, but its not the final solution adopted into HyperionNG?
Yes, I changed it in /libsrc/grabber/v4l2/V4L2Grabber.cpp only for myself because lower resolutions generated nasty images and higher resolutions caused unacceptable lag. Dont want to commit it to the project because of the issue of decimacion==1 and the live feed. Maybe it should be made in another way but it works stable and fast for me for my configuration.