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MILAVERR_NOMEDIATYPE
MILAVERR_NOMEDIATYPE belongs to WPF media timing and stream negotiation. No usable media type is available or negotiated for the selected stream. The diagnostic goal for MILAVERR_NOMEDIATYPE is to identify the first rejecting object and transition, not merely the final high-level symptom.
Where the failure occurs
For MILAVERR_NOMEDIATYPE, WPF media presentation needs both a usable stream format and a clock that can schedule decoded output. When MILAVERR_NOMEDIATYPE is returned, 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 in the MILAVERR_NOMEDIATYPE path.
For MILAVERR_NOMEDIATYPE, inspect the following boundary: stream selection and format negotiation between source, decoder, mixer, and presenter.
Smallest faithful reproducer
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 in the MILAVERR_NOMEDIATYPE path. For MILAVERR_NOMEDIATYPE, change only source format or timing control in each comparison.
- For MILAVERR_NOMEDIATYPE, enumerate media types before selecting one.
- When MILAVERR_NOMEDIATYPE is returned, test a simple uncompressed or common baseline format.
- Change only subtype or dimensions per trial in the MILAVERR_NOMEDIATYPE path.
- For MILAVERR_NOMEDIATYPE, confirm decoder output and presenter input describe the same format.
Telemetry with explanatory value
| Record | Why it matters here |
|---|---|
| Major type, subtype, dimensions, frame rate, stride, and format block | In MILAVERR_NOMEDIATYPE diagnostics, recording major type, subtype, dimensions, frame rate, stride, and format block ties the HRESULT to the WPF media timing and stream negotiation boundary rather than to the final visible failure. |
| Selected stream index and source-reported alternatives | Comparing selected stream index and source-reported alternatives shows whether MILAVERR_NOMEDIATYPE follows input, object state, or environment. |
| Decoder and renderer capabilities | Preserving decoder and renderer capabilities provides the evidence needed to test this distinction: this result is about missing format agreement, not necessarily an unrecognized container or damaged file. |
| The negotiation call or event that returned the HRESULT | For MILAVERR_NOMEDIATYPE, recording the negotiation call or event that returned the HRESULT separates the WPF media timing and stream negotiation boundary from a later wrapper symptom. |
Separate object, input, and environment
| Test | Interpretation | Hold constant |
|---|---|---|
| Same environment, reduced input | If MILAVERR_NOMEDIATYPE disappears with a smaller faithful case, complexity within WPF media timing and stream negotiation is implicated. | For MILAVERR_NOMEDIATYPE, keep major type, subtype, dimensions, frame rate, stride, and format block fixed while simplifying decoder and renderer capabilities. |
| Same input, fresh object generation | If MILAVERR_NOMEDIATYPE changes after rebuilding state, examine ownership across source reader, media-type negotiation, clock, decoder, mixer, presenter, and WPF visual. | For MILAVERR_NOMEDIATYPE, place selected stream index and source-reported alternatives on the timeline of the last successful transition. |
| Same operation on a controlled second path | If MILAVERR_NOMEDIATYPE follows one environment, the failure is not explained by source data alone. | For MILAVERR_NOMEDIATYPE, compare process architecture, media stack version, rendering tier, adapter, and session state while preserving the negotiation call or event that returned the HRESULT. |
Avoid broad resets
This result is about missing format agreement, not necessarily an unrecognized container or damaged file. For MILAVERR_NOMEDIATYPE, 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.
Completion test
A correction for MILAVERR_NOMEDIATYPE 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 “Enumerate media types before selecting one” and confirm that the following lifecycle step also succeeds. For MILAVERR_NOMEDIATYPE, keep the original failing sample and one deliberate negative case so fallback cannot be mistaken for repair.
Technical references
When MILAVERR_NOMEDIATYPE 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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