Xvid- Two different bitrates on Cd 1&2

[X-treme]

I am trying to append both .avi files with Virtual dub, but because the bitrates for this particular are different, Vdub will not all me to process it.

Is there a way to either merge them together, even though the bitrates for both cd's are different?
Or
If I have to, how do I downsample on of the cd's to be equivalant to the other in bitrate?

Thanks!

[BJ_M]

why merge them at all ?

[X-treme]

So when I play them on my stand-alone, I don't have to be interupted, and have to click the second part of the movie and play. I want it to be smooth