I want to choose I-frame from a video then I want to do something in it(I want to embed a watermark in it).How can I choose I-fram?
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You can use VideoReader() and read(). There are examples in the help.
It is a bunch of work, and usually of no value. See http://www.mathworks.co.uk/matlabcentral/answers/10402-i-frames-from-a-video-file