Reading frame from a 4K video?

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K M Ibrahim Khalilullah 2017-8-31

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https://ww2.mathworks.cn/matlabcentral/answers/354718-reading-frame-from-a-4k-video

评论： Cam Salzberger 2017-9-3

I am reading a 4k video using the following code but all frames are black!

    v = VideoReader('video1.mp4');
j=1;
while j<5
    video = readFrame(v);
    figure,imshow(video);
    j=j+1;
end

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K M Ibrahim Khalilullah 2017-9-1

Thank you very much for your comment. Yes, I read from 100 to 105 also. But the same problem. My code is Ok for 'xylophone.mp4'.

Cam Salzberger 2017-9-3

在 MATLAB Online 中打开

Hmm, that's odd that you wouldn't get the data, but also wouldn't see a codec error. MATLAB uses the OS' codec's for video reading and writing. Are you able to play the video correctly in Windows Media Player (if on Windows) on the same computer running MATLAB? If you're on Mac, check playing it with Quicktime. If Linux, try any program that uses GStreamer.

You can also try this command, and see if mp4 is listed:

formats = VideoReader.getFileFormats()

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