Compressed Media Subtypes
[The feature associated with this page, Windows Media Format 11 SDK, is a legacy feature. It has been superseded by Source Reader and Sink Writer. Source Reader and Sink Writer have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use Source Reader and Sink Writer instead of Windows Media Format 11 SDK, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
The following table lists the compressed media subtypes. These types are used to identify compressed streams in a file. When you configure a video or audio stream, you will usually use these types.
| Compressed media subtype | Description |
|---|---|
| WMMEDIASUBTYPE_ACELPnet | Audio encoded with the Sipro Labs ACELP codec. This audio is normally voice data. (No longer supported for encoding.) |
| WMMEDIASUBTYPE_MP43 | Video encoded by the Microsoft MPEG 4 codec version 3. This codec is no longer supported by the Windows Media Format SDK. If this codec is already installed on a computer, installing the Windows Media Format SDK or the redistribution package on a computer will not remove this codec. |
| WMMEDIASUBTYPE_MP4S | Video encoded using the ISO MPEG 4 codec version 1. |
| WMMEDIASUBTYPE_MPEG2_VIDEO | Video encoded to MPEG 2 specifications. |
| WMMEDIASUBTYPE_MSS1 | Video encoded with the Windows Media Screen codec version 1. |
| WMMEDIASUBTYPE_MSS2 | Video encoded with the Windows Media Video 9 Screen codec. |
| WMMEDIASUBTYPE_WMVP | Video encoded with the Windows Media Video 9 Image codec to transform bitmaps and deformation data into a video stream. |
| WMMEDIASUBTYPE_WVP2 | Video encoded with the Windows Media Video 9 Image v2 codec. |
| WMMEDIASUBTYPE_WMAudio_Lossless | Audio encoded with the Windows Media Audio 9 Lossless codec or the Windows Media Audio 9.1 codec. |
| WMMEDIASUBTYPE_WMAudioV2 | Audio encoded with the Windows Media Audio codec version 2. This value is identical to WMMEDIASUBTYPE_WMAudioV7 and WMMEDIASUBTYPE_WMAudioV8, because the bitstreams for these codec versions are compatible. |
| WMMEDIASUBTYPE_WMAudioV7 | Audio encoded with the Windows Media Audio codec version 7. This value is identical to WMMEDIASUBTYPE_WMAudioV2 and WMMEDIASUBTYPE_WMAudioV8, because the bitstreams for these codec versions are compatible. |
| WMMEDIASUBTYPE_WMAudioV8 | Audio encoded with the Windows Media Audio 8 codec, the Windows Media Audio 9 codec, or the Windows Media Audio 9.1 codec. This value is identical to WMMEDIASUBTYPE_WMAudioV2 and WMMEDIASUBTYPE_WMAudioV7, because the bitstreams for these codec versions are compatible. |
| WMMEDIASUBTYPE_WMAudioV9 | Audio encoded with the Windows Media Audio 9 Professional codec or the Windows Media Audio 9.1 Professional codec. |
| WMMEDIASUBTYPE_M4S2 | Video encoded with the ISO MPEG4 v1.1 codec. |
| WMMEDIASUBTYPE_WMSP1 | Audio encoded with the Windows Media Audio 9 Voice codec. |
| WMMEDIASUBTYPE_WMV1 | Video encoded using the Windows Media Video codec version 7. |
| WMMEDIASUBTYPE_WMV2 | Video encoded using the Windows Media Video 8 codec. |
| WMMEDIASUBTYPE_WMV3 | Video encoded using the Windows Media Video 9 codec. |
| WMMEDIASUBTYPE_WMVA | Video encoded using the version of the Windows Media Video 9 Advanced Profile codec that was released with the Windows Media Format 9 Series SDK. |
| WMMEDIASUBTYPE_WVC1 | Video encoded using the version of the Windows Media Video 9 Advanced Profile codec that was released with the Windows Media Format 11 SDK. This subtype identifies a bit stream that is compliant with the SMPTE VC-1 standard. |
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