How to extract specific frames from a video

4 次查看（过去 30 天）

Shameendra Narayan Halder 2018-7-31

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/412921-how-to-extract-specific-frames-from-a-video

评论： Imranbasha Syed 2022-5-24

Hey guys, does anyone know how to extract specific frames from a video? e.g, i want to extract 90, 150 and 160th frame and not any other frames. Does anyone know how to do it in a single for loop?

Right now i am using this code a=VideoReader('test.mp4'); for img = 1:a.NumberOfFrames; filename=strcat('frame',num2str(img),'.jpg'); b = read(a, img); imwrite(b,filename); end

But with this i can either extract all frames and not specific one.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

OCDER 2018-8-1

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/412921-how-to-extract-specific-frames-from-a-video#answer_331154

在 MATLAB Online 中打开

Try this one. Seems like read is no longer recommended, and it's replaced by readFrame. I changed the variable names too, to tell you a description of the variable as opposed to a, b, c, etc.

ReadObj = VideoReader('test.mp4'); 
CurFrame = 0;
GetFrame = [90 150 160];
while hasFrame(ReadObj)
    CurImage = readFrame(ReadObj);
    CurFrame = CurFrame+1;
    if ismember(CurFrame, GetFrame)
        imwrite(CurImage, sprintf('frame%d.jpg', CurFrame));
    end
end