videoreader reads frames very slowly. how can I improve it?

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nirit 2018-11-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/432463-videoreader-reads-frames-very-slowly-how-can-i-improve-it

I have a movie, and selected list of frames (called frameNums) I want to read.

I tried reading them like this :

VR=VideoReader(aviFilename)
for t = 1:numel(frameNums)
    currFrameNum = frameNums(t)
    VR.read(currFrameNum)
    
    %do something%
end

but this does not read the exact current frame at some of my movies (a probelm which sevral of others already noticed). so I switched to this:

VR=VideoReader(aviFilename)
videoFrameCount=0
for t = 1:numel(frameNums)
    currFrameNum = frameNums(t)
    while (hasFrame(VR) && (currFrameNum~=videoFrameCount))
        CurrFrame = readFrame(VR);
        videoFrameCount=videoFrameCount+1;
    end
    
    %do something%
 end