Matlab function, converts a movie to a folder of jpeg images

video_to_frames.m

function [num_frames, folder_name] = video_to_frames( file_name )
% Author: Seth Brown 9/27/2012
% License: MIT License
% Store each frame of the video as a numbered jpeg image
% Use: [numFrames, folderName] = video_to_frames('sample.mp4');
% TODO Error handling--specifically on grabbing frames and file write

    video = VideoReader(file_name);
    
    num_frames = video.NumberOfFrames;
    
    % Make folder to contain frame jpegs
    folder_name = 'frames';
    mkdir(folder_name);
           
    % Read one frame at a time.
    for k = 1:num_frames
        frame = read(video, k);
        
        str = sprintf('%s\\%d.jpg', folder_name, k);
        
        imwrite(frame, str);
    end
end