So if you used 8Bit Uncompressed on the PC to capture then you will need to use a 4cc changer to convert the files to the same 4cc code that is used on a Mac System. If you happened to use 10bit uncompressed the 4cc codes are the same and the AVI will work fine on the Mac System.
FYI:
Mac
v210 10bit YUV QT native .mov codec
2yuv 8bit YUV QT native .mov codec
PC
v210 10bit YUV BMD native .avi codec
uyvy 8bit YUV BMD native .avi codec
So you can download a 4cc code changer from fourcc.org. Here's the URL:
http://www.fourcc.org/changer/In the case of you using 8bit uncompressed you would want to change the uyvy (used on Windows) to 2yuv (used on mac)