Is it possible to do it with BS ???

Frame by frame can be done by pausing the movie and pressing right arrow (left for back)-only if the decoder can support that.
About capture ? Capture what ?
If you want to capture images from the movie, use P or Shift+P. (Options-> capture frame->original/what you see)

I have a proplem with this function. My captures are all black pictures.
In JPG format as well as in BMP format. Is there any help for this?

You can try a different overlay mode
(rightclick > Options > Preferences > Video > Video rendering)
Check out this post
and you can try a different setting of "Convert captured images in software" under "General" (rightclick > Options > Preferences > General)
(See the "south east" quarter of the "General" window)

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