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MILAVERR_SEEKFAILED
MILAVERR_SEEKFAILED belongs to WPF media runtime, seek, and player lifetime. The media path could not reposition playback to the requested timeline position. The diagnostic goal for it is to identify the first rejecting object and transition, not merely the final high-level symptom.
Start with the returning API
After a media object opens, asynchronous work continues in source, network, decoder, player, and rendering components., seek requests, Close, unload, callbacks, and device failures can race with that work. The first operation returning the MILAV status must be correlated with player generation and event order so a stale callback is not mistaken for a content or codec defect.
Inspect the following boundary: source seekability, byte-range access, timeline mapping, keyframe selection, or player state during seek.
Reproduce without destructive cleanup
Assign a generation number to each player instance and reject callbacks from older generations. Reproduce open, optional seek, play, stop, and close with explicit timestamps before adding network sources, DRM, or UI navigation.
- seek within a known valid range in a local file.
- When it is returned, try a keyframe-aligned position.
- Wait for MediaOpened before seeking.
- cancel or serialize overlapping seeks.
Diagnostic evidence matrix
| Record | Why it matters here |
|---|---|
| Requested and resulting positions | In this result diagnostics, recording requested and resulting positions ties the HRESULT to the WPF media runtime, seek, and player lifetime boundary rather than to the final visible failure. |
| Source duration, seekable ranges, and stream type | Comparing source duration, seekable ranges, and stream type shows whether this result follows input, object state, or environment. |
| Network range support or file stream behavior | Preserving network range support or file stream behavior provides the evidence needed to test this distinction: a seek failure does not mean normal sequential playback must fail; it identifies repositioning rather than decoding every sample. |
| Player state and seek generation | Recording player state and seek generation separates the WPF media runtime, seek, and player lifetime boundary from a later wrapper symptom. |
Useful comparison axes
| Test | Interpretation | Hold constant |
|---|---|---|
| Same environment, reduced input | If this result disappears with a smaller faithful case, complexity within WPF media runtime, seek, and player lifetime is implicated. | Keep requested and resulting positions fixed while simplifying network range support or file stream behavior. |
| 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 source duration, seekable ranges, and stream type 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 player state and seek generation. |
Limits of this code
A seek failure does not mean normal sequential playback must fail; it identifies repositioning rather than decoding every sample. 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.
What success must demonstrate
A correction for it should let the operation at the WPF media runtime, seek, and player lifetime boundary complete repeatedly under the original supported conditions. Repeat the control that begins with “Seek within a known valid range in a local file” 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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