Read specific frames from a video

Question

Naseer Khan 2016-8-21

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https://ww2.mathworks.cn/matlabcentral/answers/300341-read-specific-frames-from-a-video

回答： Tuan Nguyen 2017-5-30

I want to read some specific frames from a video.Following is my code

videoData=VideoReader(absPath);
i=1;
while hasFrame(videoData)
   img = readFrame(videoData);
   filename = [sprintf('%03d',i) '.jpg'];
   fullname = fullfile(savePath,filename);
   imwrite(img,fullname)    % Write out to a JPEG file (img1.jpg, img2.jpg, etc.)
   i = i+1;
end

Issue is that I have seen on sites that "read" method got used but it is NOT available in Matlab 2015.Is there some way? Please also tell me what would I need to do if I need to extract frames after a particular time delay?

regards

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Answer 1

Geoff Hayes 2016-8-21

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https://ww2.mathworks.cn/matlabcentral/answers/300341-read-specific-frames-from-a-video#answer_232383

Nasser - try using read instead which was introduced in R2010b (and is to be replaced by readFrame).

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Naseer Khan 2016-8-21

readFrame does not have options like frame number or read frame after some time?

Geoff Hayes 2016-8-21

Nasser - I don't understand. Do you have the function readFrame or not?

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Answer 2

Tuan Nguyen 2017-5-30

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链接

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https://ww2.mathworks.cn/matlabcentral/answers/300341-read-specific-frames-from-a-video#answer_268946

在 MATLAB Online 中打开

For example if i want to read frame 10 to 20:

arr=10:20; i=1; while hasFrame(videoData) if(i>max(arr)) break; img = readFrame(videoData); if (any(i==arr) filename = [sprintf('%03d',i) '.jpg']; fullname = fullfile(savePath,filename); imwrite(img,fullname)