K_E asked . 2022-02-01

Problems obtaining the correct number of frames in video file

I am having trouble using VideoReader to determine the correct number of frames in a video file,

videoObj = VideoReader('2_1107.mpg') ; 
Warning: Unable to determine the number of frames in this file.

This workaround fails,

lastFrame = read(videoObj, inf)
Error using VideoReader/read (line 86)
The frame index requested is beyond the end of the file.

The following code returns a different number of frames each time it's run, e.g. 164, 263, 257.

videoObj = VideoReader('2_1107.mpg'); 
nFrame = 0 ;
isGood = true ;
while isGood
    nFrame = nFrame + 1 ;
    try
        thisFrame = read(videoObj, nFrame) ;
    catch
        isGood = false ;
        nFrame = nFrame - 1 ; % Don't include in the count if fails
    end
end

If VideoReader skipping or repeating frames on each pass through the file, how can I get the correct number of frames? More info: problem is present for both R2012a and R2012b run on Windows 7 (32-bit versions), video format is MPEG-2, size of the video is 65706 KB, and it's a variable frame rate file.

videoreader , frame , mpeg , variable frame rate , mpeg-2

Expert Answer

John Williams answered . 2024-12-21 01:44:00

Have you tried something like this:

xyloObj = VideoReader('xylophone.mpg');
xylDat = read(xyloObj);
size(xylDat)

For this example, which is the mpg in the link provided, the final value in size is the number of frames. If this does not help, can you do a:

get(videoObj)

and post the results? I would be interested to see what data is missing.

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