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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. Preserve that boundary even when the visible Player message is broader than the producing operation.
Mechanism
At the checkpoint, 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. The page-specific boundary is mapping a WinMM mixer return value not recognized by the Player wrapper.
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 |
| Decisive observation | raw MMRESULT, exact mixer function, device/driver version and call parameters |
| Generation identity | Record the same disc, device, job or Player operation generation that returned this result; a reconnect or media change creates a different test. |
| Underlying result | Keep the first device, filesystem, COM, codec, DirectShow, IMAPI or BITS result seen before the Player mapped it to this result. |
| 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. |
How to interpret the next test
| Observation | Interpretation |
|---|---|
| The recorded values match the boundary | The result is consistent with mapping a WinMM mixer return value not recognized by the Player wrapper; correct that state before changing unrelated codecs, drivers or playlists. |
| A lower layer failed before this result | Preserve that earlier HRESULT or device result because it may be only the Player-level mapping. |
| The same call passes after one isolated change | The comparison supports the unknown mmresult diagnosis rather than a broad installation failure. |
| The code changes after retesting it | The boundary was passed; diagnose the new HRESULT as the next independent stage. |
It scopes the failure to mapping a WinMM mixer return value not recognized by the Player wrapper.
Controlled diagnostic sequence
- Capture
0xC00D0FA8, it, 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.
- correlate the result with mixer device ID, driver name/version, destination and source line IDs, component type, control ID/type, channel count, bounds, value payload and raw MMRESULT.
- 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.
- Create a fresh operation generation and verify that the original call advances beyond the unknown mmresult boundary.
Nearby codes with different owners
| Related result | Different diagnostic boundary |
|---|---|
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.
When verifying it, 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
- mixerOpen function.
- mixerGetLineInfo function.
- mixerGetLineControls function.
- mixerSetControlDetails function.
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