DM6446 supports an 8-bit BT.656, 8-bit or 16-bit YCbCr, or up to 16-bit RAW Bayer Pattern video input. This is detailed in the DM6446 VPFE User's Guide: http://focus.ti.com/lit/ug/sprue38c/sprue38c.pdf
DM6467 supports Two 8-Bit BT.656, Single 16-Bit BT.1120 (HD), or single RAW RGB 8,10 or 12-Bit video input. This is detailed in the DM6467 VPIF User's Guide: http://focus.ti.com/lit/ug/spruer9a/spruer9a.pdf