You must use media types to define the format of media used with the Windows Media Format SDK. For descriptions of the various media types, see Media Types.
The following table lists the global identifiers for all supported media types and their corresponding GUID values.
| Global media type identifier | GUID |
| MEDIASUBTYPE_I420 | 30323449-0000-0010-8000-00AA00389B71 |
| MEDIASUBTYPE_IYUV | 56555949-0000-0010-8000-00AA00389B71 |
| MEDIASUBTYPE_RGB1 | e436eb78-524f-11ce-9f53-0020af0ba770 |
| MEDIASUBTYPE_RGB24 | e436eb7d-524f-11ce-9f53-0020af0ba770 |
| MEDIASUBTYPE_RGB32 | e436eb7e-524f-11ce-9f53-0020af0ba770 |
| MEDIASUBTYPE_RGB4 | e436eb79-524f-11ce-9f53-0020af0ba770 |
| MEDIASUBTYPE_RGB555 | e436eb7c-524f-11ce-9f53-0020af0ba770 |
| MEDIASUBTYPE_RGB565 | e436eb7b-524f-11ce-9f53-0020af0ba770 |
| MEDIASUBTYPE_RGB8 | e436eb7a-524f-11ce-9f53-0020af0ba770 |
| MEDIASUBTYPE_UYVY | 59565955-0000-0010-8000-00AA00389B71 |
| MEDIASUBTYPE_VIDEOIMAGE | 1d4a45f2-e5f6-4b44-8388-f0ae5c0e0c37 |
| MEDIASUBTYPE_YUY2 | 32595559-0000-0010-8000-00AA00389B71 |
| MEDIASUBTYPE_YV12 | 31313259-0000-0010-8000-00AA00389B71 |
| MEDIASUBTYPE_YVU9 | 39555659-0000-0010-8000-00AA00389B71 |
| MEDIASUBTYPE_YVYU | 55595659-0000-0010-8000-00AA00389B71 |
| WMFORMAT_MPEG2Video | e06d80e3-db46-11cf-b4d1-00805f6cbbea |
| WMFORMAT_Script | 5C8510F2-DEBE-4ca7-BBA5-F07A104F8DFF |
| WMFORMAT_VideoInfo | 05589f80-c356-11ce-bf01-00aa0055595a |
| WMFORMAT_WaveFormatEx | 05589f81-c356-11ce-bf01-00aa0055595a |
| WMFORMAT_WebStream | da1e6b13-8359-4050-b398-388e965bf00c |
| WMMEDIASUBTYPE_ACELPnet | 00000130-0000-0010-8000-00AA00389B71 |
| WMMEDIASUBTYPE_Base | 00000000-0000-0010-8000-00AA00389B71 |
| WMMEDIASUBTYPE_DRM | 00000009-0000-0010-8000-00AA00389B71 |
| WMMEDIASUBTYPE_MP3 | 00000055-0000-0010-8000-00AA00389B71 |
| WMMEDIASUBTYPE_MP43 | 3334504D-0000-0010-8000-00AA00389B71 |
| WMMEDIASUBTYPE_MP4S | 5334504D-0000-0010-8000-00AA00389B71 |
| WMMEDIASUBTYPE_M4S2 | 3253344D-0000-0010-8000-00AA00389B71 |
| WMMEDIASUBTYPE_P422 | 32323450-0000-0010-8000-00AA00389B71 |
| WMMEDIASUBTYPE_MPEG2_VIDEO | e06d8026-db46-11cf-b4d1-00805f6cbbea |
| WMMEDIASUBTYPE_MSS1 | 3153534D-0000-0010-8000-00AA00389B71 |
| WMMEDIASUBTYPE_MSS2 | 3253534D-0000-0010-8000-00AA00389B71 |
| WMMEDIASUBTYPE_PCM | 00000001-0000-0010-8000-00AA00389B71 |
| WMMEDIASUBTYPE_WebStream | 776257d4-c627-41cb-8f81-7ac7ff1c40cc |
| WMMEDIASUBTYPE_WMAudio_Lossless | 00000163-0000-0010-8000-00AA00389B71 |
| WMMEDIASUBTYPE_WMAudioV2 | 00000161-0000-0010-8000-00AA00389B71 |
| WMMEDIASUBTYPE_WMAudioV7 | 00000161-0000-0010-8000-00AA00389B71 |
| WMMEDIASUBTYPE_WMAudioV8 | 00000161-0000-0010-8000-00AA00389B71 |
| WMMEDIASUBTYPE_WMAudioV9 | 00000162-0000-0010-8000-00AA00389B71 |
| WMMEDIASUBTYPE_WMSP1 | 0000000A-0000-0010-8000-00AA00389B71 |
| WMMEDIASUBTYPE_WMV1 | 31564D57-0000-0010-8000-00AA00389B71 |
| WMMEDIASUBTYPE_WMV2 | 32564D57-0000-0010-8000-00AA00389B71 |
| WMMEDIASUBTYPE_WMV3 | 33564D57-0000-0010-8000-00AA00389B71 |
| WMMEDIASUBTYPE_WMVA | 41564D57-0000-0010-8000-00AA00389B71 |
| WMMEDIASUBTYPE_WMVP | 50564D57-0000-0010-8000-00AA00389B71 |
| WMMEDIASUBTYPE_WVP2 | 32505657-0000-0010-8000-00AA00389B71 |
| WMMEDIATYPE_Audio | 73647561-0000-0010-8000-00AA00389B71 |
| WMMEDIATYPE_FileTransfer | D9E47579-930E-4427-ADFC-AD80F290E470 |
| WMMEDIATYPE_Image | 34A50FD8-8AA5-4386-81FE-A0EFE0488E31 |
| WMMEDIATYPE_Script | 73636d64-0000-0010-8000-00AA00389B71 |
| WMMEDIATYPE_Text | 9BBA1EA7-5AB2-4829-BA57-0940209BCF3E |
| WMMEDIATYPE_Video | 73646976-0000-0010-8000-00AA00389B71 |
| WMSCRIPTTYPE_TwoStrings | 82f38a70-c29f-11d1-97ad-00a0c95ea850 |
