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MILAVERR_NOREADYFRAMES
The scope of MILAVERR_NOREADYFRAMES is WPF media timing and stream negotiation. The presentation stage asked for video output but no frame was ready for the requested time. Keep 0x88980504 beside the returning method because a wrapper can replace this distinction with a generic subsystem message.
Locate the first rejecting layer
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: decoder, queue, timestamp, and scheduling state at presentation.
Misleading responses
This is not the same as MILAVERR_NOCLOCK: a valid clock may request a time for which decoding has not produced a frame. 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.
Evidence that changes the diagnosis
| Record | Why it matters here |
|---|---|
| Requested presentation time and nearest decoded sample timestamps | Preserving requested presentation time and nearest decoded sample timestamps provides the evidence needed to test this distinction: this is not the same as MILAVERR_NOCLOCK: a valid clock may request a time for which decoding has not produced a frame. |
| Decode queue depth and end-of-stream state | Recording decode queue depth and end-of-stream state separates the WPF media timing and stream negotiation boundary from a later wrapper symptom. |
| Playback rate, pause/seek generation, and discontinuity flags | In this result diagnostics, recording playback rate, pause/seek generation, and discontinuity flags ties the HRESULT to the WPF media timing and stream negotiation boundary rather than to the final visible failure. |
| Source latency and hardware-decoder events | Comparing source latency and hardware-decoder events shows whether this result follows input, object state, or environment. |
Controlled reproduction
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, start at time zero without seeking.
- Use normal playback rate and a local seekable file.
- compare software decoding with the hardware path.
- When it is returned, verify stale frames are discarded only at the correct seek generation.
Comparison tests
| 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 requested presentation time and nearest decoded sample timestamps fixed while simplifying playback rate, pause/seek generation, and discontinuity flags. |
| 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 decode queue depth and end-of-stream 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 source latency and hardware-decoder events. |
Closure criteria
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 “Start at time zero without seeking” 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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