MATLAB Answers

How to skip the no of frames in a video

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MJ Thangaraj
MJ Thangaraj on 4 Mar 2016
Commented: Walter Roberson on 23 Jan 2019
Suppose i want to read only one of every 10 frames of a Video

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James Ang
James Ang on 23 Jan 2019
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
Walter Roberson on 23 Jan 2019
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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Answers (1)

B.k Sumedha
B.k Sumedha on 4 Mar 2016
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
Walter Roberson on 4 Mar 2016
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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