ffmpeg Progress Bar

How do i make a progress bar for ffmpeg?
i know when you run ffmpeg in applescript it stops every thing until it is done converting
if there is a way to not stop every thing and to find the fps and the time then that mite help make a progress bar based a pond the fps and time
can some one help please i have been searching for hours and found nothing

Maybe if we combined c with applescript and we use c for converting the video and applescript for passing the video info to c and for getting the progress

I believe ffmpegX does something like that.

ffmpegx uses a application that checks the progress if i can do that then i’ll be happy

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