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The Windows Media MPEG4 V1/V2 decoder decodes MPEG4 V1/V2 video streams.
The class identifier (CLSID) for the Windows Media MPEG4 V1/V2 decoder is represented by the constant CLSID_CMpeg4DecMediaObject. You can create an instance of the MPEG4 V1/V2 decoder by calling CoCreateInstance.
The Windows Media MPEG4 V1/V2 decoder supports the following input media types.
The Windows Media MPEG4 V1/V2 decoder supports the following output media subtypes when it is acting as a DirectX Media Object (DMO).
The Windows Media MPEG4 V1/V2 decoder supports the following output media subtypes when it is acting as a Media Foundation Transform (MFT).
The Windows Media MPEG4 V1/V2 decoder object exposes the IMediaObject interface so that the object can be used as a DirectX Media Object (DMO), and it exposes the IMFTransform interface so that the object can be used as a Media Foundation Transform (MFT). The object has the same class identifier (CLSID) regardless of whether it acts as a DMO or an MFT.
An MPEG4 V1/V2 decoder behaves as a DMO or an MFT depending on which interfaces you obtain and which version of Windows is running. The following table shows the conditions under which an MPEG4 V1/V2 decoder behaves as a DMO or an MFT.
Operating system | Decoder behavior |
---|---|
Windows XP | An MPEG4 V1/V2 decoder always behaves as a DMO. |
Windows Vista and Windows 7 | By default, an MPEG4 V1/V2 decoder behaves as a DMO. If you obtain an Video Subtype GUIDs interface on an MPEG4 V1/V2 decoder, it behaves as an MFT. |
The globally unique identifiers (GUIDs) for RGB media subtypes differ depending on whether a decoder is acting as a DMO or an MFT. The GUIDs for non-RGB media subtypes are the same, regardless of whether a decoder is acting as a DMO or an MFT. For information about the GUIDs that represent video subtypes, see Video Subtype GUIDs.
Requirement | Value |
---|---|
Minimum supported client |
Windows XP [desktop apps only] |
Minimum supported server |
Windows Server 2003 [desktop apps only] |
Header |
|
DLL |
|
Events
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