I am trying to extract frames from a video and I have the following code.As I run the code the folder does not show the extracted frames and I don't know why?

Question

Prachi Sharma 2016-10-7

0
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https://ww2.mathworks.cn/matlabcentral/answers/306188-i-am-trying-to-extract-frames-from-a-video-and-i-have-the-following-code-as-i-run-the-code-the-folde

评论： Prachi Sharma 2016-10-13

I have the following code.It does not give any error but the folder that is supposed to hold all the extracted frames does not show any frames.Why?

videoObject=VideoReader('clouds.mp4');
  % Determine how many frames are there .
  numberOfFrames = videoObject.NumberOfFrames;
  vidHeight = videoObject.Height;
  vidWidth = videoObject.Width;
      % Ask user if they want to write the individual frames out to disk.
    promptMessage = sprintf('Do you want to save the individual frames out to individual disk files?');
    button = questdlg(promptMessage, 'Save individual frames?', 'Yes', 'No', 'Yes');
    if strcmp(button, 'Yes')
      writeToDisk=true;
      
      % Extract out the various parts of the filename.
      [folder, baseFileName, extentions] = fileparts('clouds.mp4');
      % Make up a special new output subfolder for all the separate
      % movie frames that we're going to extract and save to disk.
      folder = pwd;   % Make it a subfolder of the folder where this m-file lives.
      outputFolder = sprintf('%s/Movie Frames from %s', folder, baseFileName);
      % Create the folder if it doesn't exist already.
      if ~exist(outputFolder, 'dir')
        mkdir(outputFolder);
      end
    else
      writeToDisk = false;
      end
      % Loop through the movie, writing all frames out.
    % Each frame will be in a separate file with unique name.
    meanGrayLevels = zeros(numberOfFrames, 1);
    meanRedLevels = zeros(numberOfFrames, 1);
    meanGreenLevels = zeros(numberOfFrames, 1);
    meanBlueLevels = zeros(numberOfFrames, 1);
    for frame = 1 : numberOfFrames
    % Extract the frame from the movie structure.
    thisFrame = read(videoObject, frame);
    
    % Display it
    hImage = subplot(2, 2, 1);
    image(thisFrame);
    caption = sprintf('Frame %4d of %d.', frame, numberOfFrames);
    title(FRAMES, 'FontSize', 10);
    drawnow; % Force it to refresh the window.
      end