DV stands for Digital Video and has been defined in "Specification of Consumer-use Digital VCRs" (aka the Blue Book).

ltmmVCRControl_MediaType Constants

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typedef enum ltmmVCRControl_MediaType
{
   ltmmVCRControl_MediaType_NotPresent,
   ltmmVCRControl_MediaType_Unknown,
   ltmmVCRControl_MediaType_VHS,
   ltmmVCRControl_MediaType_DVC,
} ltmmVCRControl_MediaType;

The ltmmVCRControl_MediaType constants specify the media format of this device.

Constant	Description
ltmmVCRControl_MediaType_NotPresent	The device is empty.
ltmmVCRControl_MediaType_Unknown	Unknown type.
ltmmVCRControl_MediaType_VHS	VHS tape.
ltmmVCRControl_MediaType_DVC	DV tape.