Could some please explain the quantizer values to me?

[Falcon500]

I have found this on the ffmpeg webpage but I still don't understand it....

"The quantizer is the compression level used to encode a frame. More compression means smaller filesize and less image quality. Complex frames will require more compression in order to fit in a constant bitrate, so the quantizer will vary within the qmin/qmax range in attempt to control the bitrate. Range is 1-31, though qmin=1 is not recommended. Setting qmin=qmax will lead to variable bitrate encoding."

So in what direction do I have to set the Qmin and Qmax to get better quality. How do I obtain a constant bitrate using ffmpeg engine for encoding to Mpeg 2?

[major]

The default values are amongst the best ones.