How to determine number of frames using vision.VideoFileReader

Question

I've got a video, how could I determine number of frames in the video using matlab built-in function - vision.VideoFileReader?

It is not the same as VideoReader which I can get the number of frames by :

vidObj = VideoReader('varFrameRateFile.wmv');
numFrames = vidObj.NumberOfFrames;

Answer 1

videoFReader = vision.VideoFileReader(FILENAME) 
Frames = 0;
while ~isDone(videoFReader)
  I = step(videoFReader);
  Frames = Frames+1;
end

Update : There is an alternative solution which does not require iteration over all frames in the video .

videoSource2=VideoReader(FILENAME);
frames=read(videoSource2);
totalFrameNumber=size(frames,4);

Hope this helps..