ffmpeg : understanding mpeg4 encoding settings

[feelart]

Have not found explanation on the laconic:
http://ffmpeg.org/faq.html#Which-are-good-parameters-for-encoding-high-quality-MPEG_002d4_003f

Would some explain the meaning and use of the parameters, thanks.

Example:
ffmpeg -i 2012-0331Praha.flv -acodec copy -vcodec mpeg4 -mbd rd -flags +mv4+aic -trellis 2 -cmp 2 -subcmp 2 -g 60 -pass 1 output.avi

By trial and error I already found out:
Parameters:
-pass : integer 1...3; best = 1?
-g = keyframe interval, max 600
-subcmp (real number)
-cmp (real number)
-trellis (real number)

P.S. Just found
https://sites.google.com/site/linuxencoding/x264-ffmpeg-mapping
http://www.itbroadcastanddigitalcinema.com/ffmpeg_howto.html
http://mewiki.project357.com/wiki/X264_Settings