I had the same problem as you.

You must visit http://www.radeon2.ru/konkurs_3/27_01_04/initvi.html

I change one char in Hexeditor in ...\ATI Multimedia\main\DrvDShow.dll
Now catalyst 4.3 and MMC 8.9 can capture video from TV IN.

regards
Peter

XP Prof PL +SP1
DirectX 9b
DAO
WME 9
catalyst 4.3
MMC 8.9

Sapphire 9000Pro 64 VIVO