Reading in an Entire Video

I would like to read in an entire video as a matrix if possible. I know this runs into the memory usage problem. My main concern is that I would like to analyze the video frame by frame, in a faster manner than literally looping through the data. Ideally, I could plot the data from a region of interst to see if there has been a change in that region at any point during the video. I am currently using the CurrentTime function from the VideoReader class to just check in intervals. I also tried using memmapfile but I do not really understand how the function works.

Answer 1

[KSSV]

vidObj = VideoReader('C:\Users\Public\Videos\Sample Videos\Wildlife.wmv');
numFrames = 0;
iwant = cell([],1) ; 
while hasFrame(vidObj)
    F = readFrame(vidObj);    
    numFrames = numFrames + 1;   
    imagesc(F)
    drawnow
    iwant{numFrames} = F ;
end
numFrames

[Kevin Castell]

I have already tried this strategy and the problem is say I have a video that is 2 hours long at 60fps, if we assume that any processing i do on the frames is performed just as fast as they are played, and the loop is as fast or slightly faster than the fps, it will take at least 2 hours to process the video. I want to process the video in under 2 minutes.