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MILAVERR_VIDEOACCELERATIONNOTAVAILABLE
The scope of MILAVERR_VIDEOACCELERATIONNOTAVAILABLE is WPF video acceleration and texture resources. The requested hardware-accelerated video path is unavailable. Keep 0x88980509 beside the returning method because a wrapper can replace this distinction with a generic subsystem message.
Keep neighboring failures separate
This status says the acceleration path cannot be used; it does not by itself say that software playback is impossible. 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 the status establishes
Accelerated media playback allocates decode surfaces, mixer intermediates, presentation textures, and compositor resources under device-specific dimension and format limits. “Out of resources,” “acceleration unavailable,” and “texture too large” describe different decisions. Capture requested dimensions and formats before falling back, because software playback may hide the original GPU contract.
Capability negotiation among decoder, mixer, presenter, WPF rendering tier, and graphics driver.
Evidence to preserve
- Adapter and driver versions
- Codec, profile, level, resolution, and pixel format
- WPF rendering tier and hardware-acceleration policy
- Device-creation and video-service capability results
Reduce the scenario safely
Keep the source fixed and vary output dimensions, hardware acceleration, adapter, and rendering tier separately. A successful low-resolution or software path narrows the resource boundary but does not prove the original accelerated configuration was valid.
- Test the same media through a software path.
- Use a baseline codec profile and moderate dimensions.
- Check remote-session and virtual-machine restrictions.
- Compare with a current signed graphics driver.
Technical references
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