[FFmpeg-user] How to achieve old -croptop

[orang Aumori Jepun]

Hi all.

I recently installed the latest ffmpeg.
And I noticed the parameters are little bit changed from
the old debian ones.

Now , I want to know how to achieve the old style
ffmpeg -i INFILE.mpg -croptop 50 test.mpg
with the latest ffmpeg ( as of 27.Aug.2011)?

I'm not a native English speaker and I can not succeed in
understanging the latest ffmpeg man page.

So , someone please help me understand set up the
parameter for the latest ffmpeg.

T.I.A