--scene-ratio switch unexpected result

[wmac]

Hello,

- I am trying to extract "1 frame of every 10" frames of a video for scientific purposes. The video is 105 frames, 3.5 seconds, 30fps (MPEG4, .mov, produced by Nikon D3100) and I have uploaded it to http://host111.com/files/1.MOV

vlc 1.mov --video-filter=scene --vout=dummy --scene-ratio=10 --scene-prefix=img- --scene-path=. vlc://quit

Above command should produce 10 frames, while it produces 6 images. I tried different scene ratios and neither of them produce correct results.

- Would someone please tell me what is the problem?

Thanks.