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MILAVERR_MEDIAPLAYERCLOSED
The scope of MILAVERR_MEDIAPLAYERCLOSED is WPF media runtime, seek, and player lifetime. An operation targeted a media player that has already been closed or is completing shutdown. Keep 0x8898050D beside the returning method because a wrapper can replace this distinction with a generic subsystem message.
Read the HRESULT in context
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.
Object lifetime and asynchronous callbacks after Close, unload, disposal, or visual teardown.
Common wrong turns
This is a lifecycle result, unlike source-open or media-type errors; constructing another player may work while the stale caller remains incorrect. 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 to preserve
- Close or unload stack and timestamp
- Pending open, seek, or event callbacks
- Thread and dispatcher owning the MediaPlayer or MediaElement
- Generation or cancellation token associated with the request
A minimal test sequence
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.
- Create one player and perform the operation before Close.
- Cancel callbacks when closing.
- ignore results from earlier object instances.
- Keep teardown on the owning dispatcher and release references deterministically.
Technical references
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