Appending image frames to existing avi file

Question

JohnDylon 2016-8-8

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/298768-appending-image-frames-to-existing-avi-file

回答： JohnDylon 2016-8-8

Can anyone suggest how to append frames to an existing video file? I tried the code below in a for loop, however what I get is it can only create a new file only from given frames and doesn't append to the existing file.

    outvid=VideoWriter([vidoutpath, name_vidout]);
    outvid.FrameRate=mov.FrameRate;
    open(outvid)
    for pgc=1:length(RGBbin(1,1,1,:))
        writeVideo(outvid, RGBbin(:,:,:,pgc));
    end
    close(outvid)

Thnx.

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Answer 1

JohnDylon 2016-8-8

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https://ww2.mathworks.cn/matlabcentral/answers/298768-appending-image-frames-to-existing-avi-file#answer_231148

在 MATLAB Online 中打开

I found a workaround. Since writeVideo can't append frames to a closed video file, (in my case) closing video in an appropriate step solves the problem. For example,

open(outvid);
for bin=1:n % An individual bin contains a number of frames say 1K
   start=some calculation;
   finish=some other calculation;
     for frame=start:finish
         writeVideo(outvid, framesource(frame));
     end
     % Video object is not closed here
 end
 close(outvid);