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NS_E_MIXER_UNKNOWN_MMRESULT
Where this result occurs in the Player workflow
NS_E_MIXER_UNKNOWN_MMRESULT (0xC00D0FA8) marks mapping a WinMM mixer return value not recognized by the Player wrapper. Keep this HRESULT attached to the producing operation even when the Player shows a broader message.
Mechanism
The Player’s analog CD and legacy audio paths can address a mixer destination, source line and control through the WinMM mixer API. Line identifiers, control identifiers and value shapes are supplied by the installed audio driver rather than invented by the application.
Opening an audio endpoint or hearing sound from another application does not establish that the legacy mixer line and control requested by the Player exist. A representative way to reach this result is that a vendor mixer driver returns an undocumented result during line lookup.
State snapshot
| Evidence | Why it matters for unknown mmresult |
|---|---|
| Producing object and operation | mixer device ID, driver name/version, destination and source line IDs, component type, control ID/type, channel count, bounds, value payload and raw MMRESULT |
| Key observation | raw MMRESULT, exact mixer function, device/driver version and call parameters |
| Controlled comparison | Repeat the producing call after changing only this condition: diagnose the raw WinMM result and driver behavior instead of replacing it with a generic audio fix. |
Controlled diagnostic sequence
- Capture
0xC00D0FA8, the exact Player/API operation and the first timestamp at which it appears. - Save raw MMRESULT, exact mixer function, device/driver version and call parameters; do this before ejecting media, reconnecting a device, canceling a job or rebuilding the Player object.
- Reproduce once with the original source and destination, then apply only this change: diagnose the raw WinMM result and driver behavior instead of replacing it with a generic audio fix.
Nearby codes with different owners
| Related result | Different condition |
|---|---|
NS_E_MIXER_INVALID_VALUE | applying a value that violates the selected mixer control’s bounds or shape |
NS_E_MIXER_INVALID_CONTROL | resolving a volume, mute or routing control on a valid mixer line |
NS_E_MIXER_INVALID_LINE | resolving a requested WinMM mixer line against the current driver topology |
Focused correction
For this occurrence, diagnose the raw WinMM result and driver behavior instead of replacing it with a generic audio fix. Recreate only the object that produced it and repeat the original operation against the same controlled input.
During verification, do not write guessed control IDs or ranges into the mixer; Re-enumerate the topology after a device or driver change and retain the original MMRESULT.
Technical references
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