mismatch between calculated and reported Framerate using VideoReader
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I am trying to process video data (wmv format) recorded using a standard consumer grade camera using Matlab (R2014a, on Linux/Ubuntu) using VideoReader
vr = VideoReader('my_movie_file.wmv')
frames = read(vr); % read all frames
size(frames, 4) % gives 4025
vr.NumberOfFrames % gives 4025
vr.Duration % gives 134.7950
vr.FrameRate % gives 15
Now, this does not compute!
I.e,
round(vr.FrameRate*vr.Duration) % gives 2022,
which is half the size of vr.NumberOfFrames -- which means that the reported FrameRate is 1/2 the "calculated" value!
What am I missing?? All help will be appreciated.
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Walter Roberson
2016년 3월 22일
Is the file variable framerate? If so then the reported framerate might be the last one in the file (the one in effect at the time you queried)
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Help Center 및 File Exchange에서 Audio and Video Data에 대해 자세히 알아보기
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