DV Video Subtypes

Microsoft DirectX 9.0

DV Video Subtypes

A number of subtypes are defined for DV video. Each has a FOURCC code and a corresponding GUID value. Not all of these formats are supported; see the Remarks section for more information.

Consumer Formats

FOURCC	GUID	Data Rate	Description
'dvsl'	MEDIASUBTYPE_dvsl	12.5 Mbps	SD-DVCR 525-60 or SD-DVCR 625-50
'dvsd'	MEDIASUBTYPE_dvsd	25 Mbps	SDL-DVCR 525-60 or SDL-DVCR 625-50
'dvhd'	MEDIASUBTYPE_dvhd	50 Mbps	HD-DVCR 1125-60 or HD-DVCR 1250-50

Refer to IEC-61834 for more information about these formats.

Professional Formats

FOURCC	GUID	Data Rate	Description
'dv25'	MEDIASUBTYPE_dv25	25 Mbps	DVCPRO 25 (525-60 or 625-50)
'dv50'	MEDIASUBTYPE_dv50	50 Mbps	DVCPRO 50 (525-60 or 625-50)
'dvh1'	MEDIASUBTYPE_dvh1	100 Mbps	DVCPRO 100 (1080/60i, 1080/50i, or 720/60P)

Refer to SMPTE 314M for more information about dv25 and dv50, and SMPTE 370M for more information about dvh1.

Miscellaneous

Two additional DV subtypes are defined in the header file Uuids.h. These correspond to FOURCC codes that are produced by certain DV codecs; they do no correspond to any defined DV standards. These subtypes are obsolete and should not be used.

FOURCC	GUID
'DVCS'	MEDIASUBTYPE_DVCS
'DVSD'	MEDIASUBTYPE_DVSD

Remarks

When data is captured from an external DV device, the MSDV driver parses the transport data, while the DV Splitter and DV Video Decoder filters parse the contents of the data packets. Currently, these components provide the following support:

The MSDV driver supports data rates up to 25 Mbps. It does not support 50 Mbps or higher data rates. For 25-Mbps streams, the MSDV driver sets the media type to MEDIASUBTYPE_dvsd regardless of the source (SDL-DVCR or DVCPRO 25).
The DV Splitter and DV Video Decoder filters support MEDIASUBTYPE_dvsd only. The data can be PAL or NTSC. Third-party filters or codecs may be available that can parse other DV formats, as long as the data rate is supported by the MSDV driver.

In practice, this means applications can capture both 25-Mbps formats, SDL-DVCR and DVCPRO 25. Application can transmit both formats to tape, as long as the target device matches the capture device. In other words, if you capture DVCPRO 25 from a device, you can transmit it back to the same device, but not to an SDL-DVCR device.

See Also