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.
lastFrame = read(videoObj, inf)
Error using VideoReader/read (line 86)
The frame index requested is beyond the end of the file.
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
x
This workaround fails,
The following code returns a different number of frames each time it’s run, e.g. 164, 263, 257.
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.
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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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