How can i write multiple video files? with videoWriter?

Question

Bilal qureshi 2018-6-1

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/403521-how-can-i-write-multiple-video-files-with-videowriter

评论： Walter Roberson 2018-6-1

I want to write multiple video files and my conditions are here

   j=1
   if (t >= 125)
    writerObj1 = VideoWriter('voilation1.avi');
    open(writerObj1);
    writerObj2 = VideoWriter('violation2.avi');
    open(writerObj2);
   disp("<--------- Violation Detected----------> ")
    vidname=strcat('writerObj',num2str(j));
    writeVideo(vidname,img1);  
    end 
    if(t ==600)
     close(vidname); 
    j=j+1;
    end

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Answer 1

KSSV 2018-6-1

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/403521-how-can-i-write-multiple-video-files-with-videowriter#answer_322764

在 MATLAB Online 中打开

X = rand(100,1) ;
writerObj1 = VideoWriter('Video1.avi');
writerObj2 = VideoWriter('Video2.avi');
writerObj1.FrameRate = 10;
writerObj2.FrameRate = 10;
% open the video writer
open(writerObj1);
open(writerObj2);
h1 = figure(1) ;
hax1=axes ;
hold on
h2 = figure(2) ;
hax2=axes ;
hold on
for i = 1:length(X)
    if X(i)<0.5
        plot(hax1,i,X(i),'.r')
        f1 = getframe(h1);
        writeVideo(writerObj1, f1);
    else
        plot(hax2,i,X(i),'.b')
        f2 = getframe(h2);
        writeVideo(writerObj2, f2);
    end
    % close the writer object
end
close(writerObj1);
close(writerObj2);

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Bilal qureshi 2018-6-1

在 MATLAB Online 中打开

its not only two objects i want to make dynamically writing object with loop ??

how can i write like this

vidname=strcat('writerObj',num2str(j));
  writeVideo(vidname,img1);

Walter Roberson 2018-6-1

You cannot. You need to call VideoWriter to create a new object for the new file. writeVideo does not accept a file name as a parameter, and there is no way to change the file name associated with a VideoWriter object after you have created the object.

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