I guess this has to do with that the fact AVIFile doesn't support non-mod4? Perhaps...
Tiny issue in the 2.6 documentation
status: open --> closed-fixed
status: open --> closed-fixed assigned_to: Wilbert Dijkhof
Tiny flaws in the 2.6 documentation
Thanks. Fixed online and will be fixed in the next offline version.
avisource and non-mod 4 wide avi