Okay I'm looking to see if the ffmpeg render capability for flv can be adjusted. Does any one know how this can be done?

Why I'm asking:

One of my Site Editors was uploading a video file, wmv format 3.4mb when uploaded and rendered to flv it became 12.8mb!!!

Another wmv file jumped from 13mb to a 47mb flv ...this is crazy rendering for a streaming video hosting website!

Now I'd like to view the ffmpeg settings to tweak the render quality - Is this do-able?

Dafydd