Bad extract in 'extract an image from a film'

[OMT]

I try to work with a film 'week-end.wmv' made with some REIMS friends the 8 may 2009.

This film - coded in 720*480 pixel - is a video with 2'04'' length.

I place the cursor in different places to extract one image each time.

When I ask XNVIEW to extract images ( one by one at different position), it is the same image which is extracted ( I think the first image the film ).

[xnview]

Yes, sometimes i have problem to seek in a video...

[OMT]

It's a strange bug.

Indeed, in the option box 'extract an image from am ovie', the correct frame is displayed when I change the cursor position.

So, I just imagine that the extracted frame in a image will be correct too...