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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.
Where the failure occurs
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.
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. Change only source format or timing control in each comparison.
- enumerate media types before selecting one.
- Test a simple uncompressed or common baseline format.
- Change only subtype or dimensions per trial.
- Confirm decoder output and presenter input describe the same format.
Evidence to preserve
- Major type, subtype, dimensions, frame rate, stride, and format block
- Selected stream index and source-reported alternatives
- Decoder and renderer capabilities
- The negotiation call or event that returned the HRESULT
Avoid broad resets
It is about missing format agreement, not necessarily an unrecognized container or damaged file. 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.
Technical references
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