How to skip the no of frames in a video

Question

MJ Thangaraj 2016-3-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/271390-how-to-skip-the-no-of-frames-in-a-video

评论： Walter Roberson 2019-1-23

Suppose i want to read only one of every 10 frames of a Video

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James Ang 2019-1-23

hi, does the answer really tell how to read every 10th frame of the video? as in frame 10,20,30,40...etc

Walter Roberson 2019-1-23

You can loop passing in one frame index at a time to the read() method. Or you can fetch the estimate of the number of frames and calculate 10:10:NumbeOfFrames as the index for the read() method. Watch out for the fact that the number of frames is only an estimate.

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Answer 1

B.k Sumedha 2016-3-4

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https://ww2.mathworks.cn/matlabcentral/answers/271390-how-to-skip-the-no-of-frames-in-a-video#answer_212281

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Use read option to read only particular frames.Remaining files will be discarded automatically.

    v = VideoReader('xylophone.mp4');
    %Read only the first video frame.
    video = read(v,1);
    %Read only the last video frame.
    video = read(v,Inf);
    %Read frames 5 through 10.
    video = read(v,[5 10]);
    %Read from the 50th frame to the end of the video file.
    video = read(v,[50 Inf]);

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Walter Roberson 2016-3-4

Using read() is no longer recommended for reading frames from VideoReader objects. The recommendation now is to use readFrame(), which can read one frame at a time. You can loop discarding frames if you want. See http://www.mathworks.com/help/matlab/import_export/read-video-files.html

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