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MILAVERR_NOCLOCK
The scope of MILAVERR_NOCLOCK is WPF media timing and stream negotiation. The media presentation path has no usable timing clock. Keep 0x88980500 beside the returning method because a wrapper can replace this distinction with a generic subsystem message.
Limits of this code
A missing clock is different from MILAVERR_NOREADYFRAMES: one lacks the time authority, while the other can have timing but no frame ready. Do not treat the constant name as a complete root-cause report; preserve the nested media, COM, graphics, or driver result before resetting the player.
Start with the returning API
When it is returned, WPF media presentation needs both a usable stream format and a clock that can schedule decoded output. Source opening, stream selection, decoder output type, queued frames, and presentation time are related but distinct checkpoints. A playable file in another application does not prove that the WPF path negotiated the same stream or requested the same presentation time.
Inspect the following boundary: clock selection, association, or lifetime before playback scheduling.
Diagnostic evidence matrix
| Record | Why it matters here |
|---|---|
| Player state and MediaClock or timeline identity | Comparing player state and MediaClock or timeline identity shows whether this result follows input, object state, or environment. |
| Current position, rate, duration, and clock controller state | Preserving current position, rate, duration, and clock controller state provides the evidence needed to test this distinction: a missing clock is different from MILAVERR_NOREADYFRAMES: one lacks the time authority, while the other can have timing but no frame ready. |
| Source-open and media-open events preceding playback | Recording source-open and media-open events preceding playback separates the WPF media timing and stream negotiation boundary from a later wrapper symptom. |
| Thread and lifetime of the object that owns the clock | In this result diagnostics, recording thread and lifetime of the object that owns the clock ties the HRESULT to the WPF media timing and stream negotiation boundary rather than to the final visible failure. |
Useful comparison axes
| Test | Interpretation | Hold constant |
|---|---|---|
| Same environment, reduced input | If this result disappears with a smaller faithful case, complexity within WPF media timing and stream negotiation is implicated. | Keep player state and MediaClock or timeline identity fixed while simplifying source-open and media-open events preceding playback. |
| Same input, fresh object generation | If this result changes after rebuilding state, examine ownership across source reader, media-type negotiation, clock, decoder, mixer, presenter, and WPF visual. | Place current position, rate, duration, and clock controller state on the timeline of the last successful transition. |
| Same operation on a controlled second path | If this result follows one environment, the failure is not explained by source data alone. | Compare process architecture, media stack version, rendering tier, adapter, and session state while preserving thread and lifetime of the object that owns the clock. |
Reproduce without destructive cleanup
Use a short local file with one ordinary audio/video stream, then log open, media-opened, clock, position, natural dimensions, and frame availability in order., change only source format or timing control in each comparison.
- When it is returned, run the same source with the player controlling its own clock.
- Attach the intended clock before starting or seeking.
- verify the clock is not stopped or detached during asynchronous open.
- When it is returned, test pause, resume, and rate changes independently.
What success must demonstrate
A correction for it should let the operation at the WPF media timing and stream negotiation boundary complete repeatedly under the original supported conditions. Repeat the control that begins with “Run the same source with the player controlling its own clock” and confirm that the following lifecycle step also succeeds. Keep the original failing sample and one deliberate negative case so fallback cannot be mistaken for repair.
Technical references
When it is returned, these references define the public API family, object model, or error list used to interpret this status.
- Microsoft Open Specifications: HRESULT values.
- Microsoft: Multimedia overview for WPF.
- Microsoft: MediaElement class.
- Microsoft: MediaClock class.
- Microsoft: WPF graphics rendering tiers.
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