Number of Video Frames doesn't Match Actual Computations

I have a 25fps video that I'd like to do some further processing using MATLAB. The video was 5.03seconds long. Now, using the following codes:

video = VideoReader(video01);
video.NumberOfFrames

and a loop counter, with fcounter initialised to 1,

while hasFrame(video)
  fcounter = fcounter + 1;
end

Both returned a total number of frames of 128. However, if we do the calculations, given an fps of 25 and total video time of 5.03sec, shouldn't it return a total number of frames equal to (25)(5.03) = 125.75 = 125? 128 number of frames and a 25fps would mean a video length of 5.12secs, which doesn't add up/match. Is there something wrong with my calculations? Or does MATLAB append or do some overlaps on the frames internally? I'm using MATLAB R2016b.

Thank you!

[Walter Roberson]

But is it 25 fps? A lot of videos these days are variable frame rate.

[PaTchoRa]

Good day sir! Yes, I checked it using ffmpeg. Actually, I already had my answer to this a while ago: I did the probing itself using Matlab and it returned a duration of 5.12s. Though when I checked it using players, they only returned the 5.03s.

I'll take a shot to this and assume that it's the players that are at fault. Or is it related to what you said being the video having variable frame rate?

The ffmpeg did say an fps of 25, as well as Matlab. Thank you!