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The following table provides information about the Windows Media Encoder features that have specific Microsoft Windows Media Player, operating system, or codec requirements.
| Feature | Windows Media Player | Operating systems |
Codecs | ||
| 6.4 | 7.1/Windows XP | 9 Series | |||
| Interlaced output video | X | Microsoft Windows XP |
Windows Media Video 9 |
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| Nonsquare pixel output | X | ||||
| Multiple-resolution MBR content | X | ||||
| MBR audio | X | ||||
| DRM support | X | X | X | ||
| Multichannel audio | X | Microsoft Windows XP |
Windows Media Audio 9 Professional or Windows Media Audio 9 Lossless |
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| High-resolution audio (24-bit, 96 kHz)1 | X | Microsoft Windows XP |
Windows Media Audio 9 Professional |
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| Dynamic range control | X | Microsoft Windows XP |
Windows Media Audio 9 Professional |
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| CBR encoding (one- or two-pass) | X | X | X | See the following table |
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| Quality-based VBR | X | X | See the following table |
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| Bit rate-based VBR | X | X | See the following table |
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| Peak bit rate-based VBR | X | X | See the following table |
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1 Earlier players or operating systems will render 16-bit, 48-kHz content
Note that content encoded with the Windows Media Audio and Video 9 Series codecs (except for the Windows Media Audio 9 codec) is not supported in Windows Media Player version 6.4. For Windows Media Player version 7.1 and Windows Media Player for Windows XP, content encoded with any of the codecs requires users to download the codec before playback. Content encoded using VBR encoding with the Windows Media Audio 9 codec may have glitches or silence during playback in Windows Media Player version 6.4. For Windows Media Player version 7.1 and Windows Media Player for Windows XP, content encoded with the Windows Media Audio 9 codec does not require a user to download the codec.
The following table lists the supported encoding methods for the codecs that are included with the encoder.
| Codec | One-pass CBR | Two-pass CBR | Quality-based VBR | Bit rate-based VBR | Peak bit rate-based VBR |
| Windows Media Audio 9 Professional | Yes | Yes | Yes | Yes | Yes |
| Windows Media Audio 9 Lossless | No | No | Yes | No | No |
| Windows Media Audio 9 |
Yes | Yes | Yes1 | Yes1 | Yes1 |
| Windows Media Audio 9 Voice |
Yes | No | No | No | No |
| Windows Media Video 9 |
Yes | Yes | Yes | Yes | Yes |
| Windows Media Video 8.1 |
Yes | Yes | Yes | Yes | Yes |
| Windows Media Video 7 |
Yes | Yes | Yes | Yes | Yes |
| Windows Media Video 9 Screen |
Yes | No | Yes | No | No |
1 Some glitches or silence may occur during playback in Windows Media Player version 6.4.