Need math help, bit rates

Sorry, I know this should be in the compressor or DVD SP forum, but there isn't enough traffic there and I need this ASAP. Hope someone knows bitrate calculations well. I have a file. The total bitrate is 7.15Mb/s. THe audio is 224Kb/s at 48KHz ac3. what is the video average bitrate?
Streamclip tells me the video is 8Mb/s, so obviously it is a VBR file, cause if the entire thing is only 7.15, the video can't be 8 down the whole thing. So I need the average bitrate to match another file that I have yet to compress.
Matt
p.s. I wouldn't mind learning to fish as well, if you are so inclined...
Message was edited by: RedTruck

Hey,
Thanks for the reply. The file was given to me on a DVD. I have permission to rip and re-burn along with another file that I am creating. It is obviously MPEG2, but I already ripped and demuxed, so I now have the m2v.
I have another movie going on the same track (has to be a track so I can make a story in Studio Pro and have smooth playback for a presentation.)
Using MPEG Streamclip for diagnosis, the m2v is 8 Mbs. The audio file is ac3 at 224 Kbs. The entire movie clocked out at 7.15 Mbs. So I need to calculate the average bit rate for the video so I can encode my movie at the same rate.
The whole 1024 bits to bytes and 4.7GB on a disk which is actually 4.38... ah... bloowey... I can't figure out exactly the bit rate so they will fit in the same track. I am actually re-encoding her movie right now so I can just duplicate the setting. But I would still like to know how to get an accurate calculation for the future. I have had to do this before and I always wind up wasting time re-encoding.
Thanks for any help you can give.
Matt

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