There is a
report in the german doom9/Gleitz forum that Canopus DV AVIs (FourCC: 'CDVC', decoded by Canopus DV decoder, neither ffdshow nor lav are installed) are not played with current versions of madVR via MPC-HC 1.6.5, but it worked with a very old version (0.09, from VideoHelp archives). Converted to MS DV, playback works.
Where might be the reason, are there raw video formats not supported anymore by madVR?