背景

最近由于處理數(shù)據(jù)集的需要，需要截取一段視頻，并將其中的視頻畫面縮小為原圖1/4。

代碼

%read the video
inputVideo = VideoReader('G:/nordland/spring.mp4');

%set the output video parameter
startFrame = 5000;
endFrame = 5010;
outputvideoName = 'G:/nordland/spring5000_6000.avi';
if(exist(outputvideoName,'file'))
    delete(outputvideoName);
end
outputVideo=VideoWriter(outputvideoName);
outputVideo.FrameRate=inputVideo.FrameRate;

%handle and output the video
open(outputVideo);
for i = startFrame:endFrame
    inputFrame = read(inputVideo,i);
    %resize the origin size to 1/4
    frame = imresize(inputFrame,0.25);
    writeVideo(outputVideo,frame);
end

%close
close(outputVideo);