http://valinet6l6tq6d5yohaa6gdsf2ho4qcqcxyj2nahp5kd4z7nsa6ycdqd.onion/2024/07/23/Proper-and-easy-RAM-reservation-for-embedded-devices-running-Linux.html
Well, technically a bit after the user requests so, as frame grabbing would have to take place at specific moments (probably when the video pipeline just finished writing a new frame) in order to avoid having the image teared (saving the data when the video pipeline is just writing a new frame), but for the sake of this exercise let’s not bother with that and the fact that the thing would be merely an illusion and not immediate (interrupt style, let’s say).