How to replace a frame (rgb image) in a small video sequence ?

Question

raviraja 2017-2-13

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https://ww2.mathworks.cn/matlabcentral/answers/324731-how-to-replace-a-frame-rgb-image-in-a-small-video-sequence

编辑： Walter Roberson 2018-4-21

I want to replace a single rgb frame in a 4 sec video sequence, example i want to replace the 5th frame with my rgb image of same dimension as the video dimension (example 256x256)

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Answer 1

Walter Roberson 2017-2-13

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https://ww2.mathworks.cn/matlabcentral/answers/324731-how-to-replace-a-frame-rgb-image-in-a-small-video-sequence#answer_254547

在 MATLAB Online 中打开

    vid = 'NameOfTheVideo.avi';
    obj = VideoReader(vid);
    newobj = VideoWriter('NameOfNewVideo.avi', 'Uncompressed AVI');
    replacement_frame_5 = randi([0 255], 256, 256, 3, 'uint8');   %or as appropriate
    fr = 0;
    while hasFrame(obj)
        fr = fr + 1;
        a = readFrame(obj);
        if fr == 5
           a = replacement_frame_5;
        end
        writeVideo(newobj, a);
    end
    close(newobj);
    clear obj

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raviraja 2017-2-21

Hi Mr. Walter, thanks for the help with minor modification it works just fine, after replacing the frame in video how to display the video ? I used implay but it showing me some error I am attaching the screenshot here can you suggest me here,, I saved the video file in 'writer' variable name attaching that variable data also again thanks for the help...

Walter Roberson 2018-4-21

编辑：Walter Roberson 2018-4-21

It is not possible to play a video writer object. Once the video writer object is closed, use one of the techniques to play the video by name. Or create a video player object and step(player, a) as you go through outputting the frames to the video writer object.

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