Using while loop in a video

Question

Eliska Paulikova 2022-10-25

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1834573-using-while-loop-in-a-video

编辑： KALYAN ACHARJYA 2022-10-25

Hello, My goal is to read a video, than split it to different number of frames, and than make it stop. It still does not work. Please help

vid=VideoReader("video.mp4");
k=200;
 
    while hasFrame(vid)
        frame=readFrame(vid);
    
            numberOfFrames = vid.NumFrames;
            framesToRead = 1:k: numberOfFrames;
            limit=length(framesToRead);
      
            for h = 1:length(framesToRead)
                if h<limit 
                   thisFrame = read(vid, framesToRead(h));
                else
                    break
                
                end 
            end   
                    
    end

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Eliska Paulikova 2022-10-25

Well I have a video which has more than 100 000 frames --> So I need to read every 2000 frames. I now I have there the step k=200 but it suppose to be 2000

But still it does not work

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

KALYAN ACHARJYA 2022-10-25

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1834573-using-while-loop-in-a-video#answer_1082908

编辑：KALYAN ACHARJYA 2022-10-25

在 MATLAB Online 中打开

vid=VideoReader('video.mp4');
frame_num=vid.NumFrames;
frame_format='.jpg';
vid=read(vid);
for i=1:frame_num %Initial Level: Check with less number of frames, e.g.i=1:5
    frame_name=num2str(i);
    file_name=strcat(frame_name,frame_format);
    Vid_frame=vid(:,:,:,i);
    imwrite(Vid_frame,file_name);%Save the frame in the current directtory
    % Or you can save the frame(images) into specific directory also. 
end