how to divide the .wmv (movie) format to multiple images?

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ajith 2012-12-17

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https://ww2.mathworks.cn/matlabcentral/answers/56762-how-to-divide-the-wmv-movie-format-to-multiple-images

sir, Now i need to know how to make the .wmv movie to the multiple frames of the images. here i use the mmreader function to find the frames but it shows the error the

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

1. how to find the number of frames in the .wmv

2. Next how to make the movie to the multiple images

回答（1 个）

Walter Roberson 2012-12-17

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https://ww2.mathworks.cn/matlabcentral/answers/56762-how-to-divide-the-wmv-movie-format-to-multiple-images#answer_68695

The movie is a variable-time movie. You need to read in the entire movie once before mmreader knows the number of frames in the movie.

You use mmreader to read one frame at a time, and imwrite() the cdata of the frame to a file.

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ajith 2012-12-31

编辑：ajith 2012-12-31

在 MATLAB Online 中打开

sir i get the total number of frame at 498 by using this code

readerobj = mmreader('dec072012132350.wmv');
frame = read(readerobj,inf);
readerobj.NumberOfFrames
Warning: Unable to determine the number of frames in this file.
ans =
     498
  now I found the number of frames
  end

but i save the code in editor window to run it shows the ans=1 but in the command window i run separately each codes line by line it shows the ans = 498 how its possible

and also i run your script

readerobj = mmreader('dec072012132350.wmv');
fidx = 1;
while true
  try 
    frame = read(readerobj, fidx);
  catch ME
    break;
  end
  imgname = sprintf('frame%05d.tif', fidx);
  imwrite(frame, imgname);
  fprintf('wrote frame to %s\n', imgname);
  fidx = fidx + 1;
end

in the command window its show the more than 498 frames been saved and also run accords through the editor window show ans = 3 but separately in command window its gives the result of saved images more than 498 frames . i didn't have deep knowledge in the mmreader concept so clearly explain as soon as possible sir