MATLAB: How to take every nth frame from video and make separate video of those taken frame

digital image processingimage processing

I want to take every 20th frame from a 30fps video file of size 1GB and make another video of 2fps video from those taken frames in an efficient way. I am working on laptop having 4GB RAM and 64-bit windows 8.1

Best Answer

        vidObjIn = VideoReader(INFILENAME);
        vidObjOut = VideoWriter(OUTFILENAME, 'FrameRate', 2);
        while hasFrame(vidObjIn)
            got_end = false;
            for K = 1 : 20
              if ~hasFrame(vidObjIn)
                got_end = true;
                break;
              end
              vidFrame = readFrame(vidObjIn);
            end
            if got_end
              break;
            end
            writeFrame(vidObjOut, vidFrame);
        end
        close(vidObjIn)
        close(vidObjOut)
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