What does HRESULT 0xC00D1BB8 (NS_E_MULTIPLE_AUDIO_FORMATS) mean?

NS_E_MULTIPLE_AUDIO_FORMATS

Where the Encoder produces this result

0xC00D1BB8 (NS_E_MULTIPLE_AUDIO_FORMATS) identifies audiences use different audio formats while legacy Player 7.1 compatibility is requested. This is an Encoder validation error; a later “cannot start encoding” dialog can hide the original HRESULT.

Windows Media Encoder profiles can be checked for compatibility with older Windows Media Player generations. VBR, multiple audiences, audio/video format variation, interlace and non-square pixels can move a profile beyond the version 7.1 compatibility envelope.

What has already succeeded

The profile may be valid for Windows Media 9 or later and still be intentionally rejected when an older compatibility target is required. For example, audiences vary sample rate to optimize bitrate but compatibility is fixed at 7.1. Reproduce the condition at the Encoder object that returned the HRESULT rather than treating it as a general codec or operating-system failure.

A controlled diagnostic sequence

1. Record 0xC00D1BB8, the Encoder version and the exact API call or property access that returned it.
2. Export the current .wme or .prx configuration, then capture audio format index, channels, sample rate and bitrate per audience.
3. Verify the legacy player compatibility rules precondition without changing the source, profile and output sink at the same time.
4. Run one controlled comparison that changes only the identified precondition: use one common audio format or stop targeting the legacy player.

Nearby HRESULTs that mean something else

Corrective action at the right layer

Do not describe a compatibility result as codec corruption; first decide whether support for the older player is a real requirement.

Technical references

• Detecting profile compatibility.
• IWMEncProfile2.VBRMode.
• Selecting a video codec for an audience.
• Adding an audience to an encoder profile.