HRESULT 0xC00D4A3E (MF_E_SAMPLEALLOCATOR

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The video sample allocator has no free sample because allocated samples are still outstanding.

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MF_E_SAMPLEALLOCATOR_CANCELED	MF_E_SINK_ALREADYSTOPPED

MF_E_SAMPLEALLOCATOR_EMPTY

MF_E_SAMPLEALLOCATOR_EMPTY means the allocator's current pool has no sample available for the request. This is not automatically an out-of-memory condition: allocated video samples can still be held by the presenter, mixer, decoder, application, or another asynchronous stage.

Find which samples have not returned to the pool

Count successful AllocateSample calls and sample releases for the active allocator generation.
Use allocator release notifications when available to see when a sample actually becomes reusable.
Inspect extra COM references and queues that retain IMFSample or its Direct3D surface after rendering work should be complete.

The allocator is initialized with a requested number of frames, and released samples return to the available pool. Increasing that count may hide a leak or stalled consumer. First establish whether the pool is merely experiencing expected back pressure or whether a sample is never returned.

Microsoft: AllocateSample · Microsoft: allocator initialization · Microsoft: sample release notification

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