Irfan - try using the videoreader to load the video and read only the frames that you are interested in. The videoreader object will tell you the frame rate and from that you can figure out which set of frames to extract (those correspondng to the 10-18 second period). For example,
v = VideoReader('myVideo1.mp4');
fs = v.FrameRate;
frames = read(v,[(9*fs+1) Inf]); % read from 10-18 seconds
