Videoreader cannot read video frames properly

For example a *.wmv video length is 10 sec. Frame per second 50. Total frame= 10*50 =500 frames.

But Matlab NumberofFrames function gives 351 frames.

When same video start a blackframe, this time function gives 500 frames.

What can I do? What is problem? I think that the problem is Matlab videoreader function.

Answer 1

[Walter Roberson]

It might be a variable framerate movie. Or the recording process might not have been able to store frames fast enough leading to frames being skipped.

[seyit kara]

Thanks, but I think the problem is big. There is a problem Matlab videoreader function.

[Walter Roberson]

Was the video written using videoWriter class? If so then which MATLAB release are you using and which operating system?

[seyit kara]

The video written Edius program. Is that important? any video can be.

Op. system win 7 64 bit. Matlab R2013a

I said that Matlab NumberofFrames function gives 351 frames.

When same video start a blackframe, this time function gives 500 frames.