如何用Matlab分割电影

Question

我想编写一个程序来分割选定长度的电影。以下是我的代码。

movieFullFileName = '001.mp4';
videoObject = VideoReader(movieFullFileName);

% Determine how many frames there are.
numberOfFrames = videoObject.NumberOfFrames;
vidHeight = videoObject.Height;
vidWidth = videoObject.Width;

% Create a VideoWriter object to write the video out to a new, different file.
writerObj = VideoWriter('new001.mp4', 'MPEG-4');
open(writerObj);

for frame = 1 : 1000
    % Extract the frame from the movie structure.
    thisFrame = read(videoObject, frame);

    writeVideo(writerObj, thisFrame);
end

close(writerObj);

问题是它会重新格式化电影，但我想要的只是分割电影然后直接输出。如何用Matlab做到？