Has anybody run into this (I'm sure SOMEBODY has)?

I pull a file into NERO to check to see how big the file is. After using the bitrate calculator, I am pleased to see the file come in under the 80 min mark. I check the movie and find the audio needs syncing with the video. I split the video from the audeo and either add or subtract seconds in Cool Edit. I multiplex everything back together and with the audio "synced up", I pull it back into NERO. This time the movie is apprx 10 minutes OVER the 80 min limit.

What gives?

Is that just one of those mysteries of life, or am I doing something wrong?

trapped in time,
Gallant1