divide the multiple frames

sir,

In the movie file consists the 498 frames i process the all frames for my project gone for out of memory so that i would like to process only the 7multiples of frames. my doubt is regards how to taken the all multiples of 7 frames in the loop format

i did

    readerobj = mmreader('dec.wmv');
    frame = read(readerobj,inf);
    y=readerobj.NumberOfFrames; 
    for loop=1:y
    loop=loop+7;     
    Image = read( readerobj,loop);

but its not taken the 7 multiples of frame how to resolve it

Answer 1

[Walter Roberson]

for loop=1:7:y 
  Images = read( readerobj,[loop loop+6]);

[ajith]

y =498

for loop=1:7:y 
  Images = read( readerobj,[loop]);

shows the error ??? The frame index requested is beyond the end of the file.

Error in ==> mmreader.read at 74 videoFrames = read(getImpl(obj), index);

Error in ==> mainfunctionclc at 17 Image = read( readerobj,[loop]);

how to resolve the error sir

[Walter Roberson]

Is your dec.wmv file a Variable Frame Rate? Are you getting warnings about it being variable frame rate, or is readerobj.NumberOfFrames returning reasonable values?

[ajith]

yes sir shows the reasonable value as 498

[Walter Roberson]

Try

for loop = 480:498
  fprintf('about to try frame %d\n', loop);
  try
    Images = read(readerobj, loop);
    fprintf('got frame %d\n', loop);
  catch ME
    fprintf('problem on frame %d\n, loop);
  end
end

and see how far it gets.

[ajith]

Warning: Unable to determine the number of frames in this file.

about to try frame 480

got frame 480

upto 498 frames are processed sir but loop starts from 1 to 498 frames shows beyond the out of frames