How to get the time information from a video of varying frame rate using MATLAB?

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Richard 2012-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/27795-how-to-get-the-time-information-from-a-video-of-varying-frame-rate-using-matlab

编辑： Walter Roberson 2013-9-27

I have a video in which the frame rate is not constant over the length of video. How can i get the actual time information from the video using MATLAB?

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Walter Roberson 2012-2-2

I wonder... if you have read *only* up to a particular frame, and you get the Duration property of the VideoReader object, would it perhaps give the frame time?

If this works at all, it would not surprise me if the Duration never decreases if you go back to read a previous frame.

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Answer 1

Glen Lichtwark 2012-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/27795-how-to-get-the-time-information-from-a-video-of-varying-frame-rate-using-matlab#answer_36138

I think the solution is covered in the following page -

http://www.mathworks.com.au/help/techdoc/import_export/f5-132080.html#br9cnb8-1

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Walter Roberson 2012-2-3

No, there is nothing there about determining the time associated with any one frame. That document just says that you cannot read frames in random order, and that you need to read to the end before MATLAB knows how many frames there were. Nothing about frame timing.

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