What does HRESULT 0xC00D1B61 (NS_E_AUDIODEVICE_BUSY) mean?

NS_E_AUDIODEVICE_BUSY

NS_E_AUDIODEVICE_BUSY: the failing boundary

NS_E_AUDIODEVICE_BUSY (0xC00D1B61) means It is not possible to open the specified audio capture device because it is currently in use. The important boundary is audio capture ownership; do not replace this result with a broader “Windows Media failed” diagnosis.

What this result proves

This code proves that the selected audio capture endpoint is already in use in a mode that prevents this open. It does not, by itself, prove a codec, permissions, network, device, or media problem outside that boundary. Preserve the first lower-level result when one exists, because later Player or Encoder errors can hide the original cause.

Evidence and focused verification

Record endpoint identity, sharing/exclusive mode, active capture clients, and requested format; release the competing owner and retry the same endpoint. Keep the media object, endpoint, profile, or device identity fixed while changing only that rejected precondition. A successful retest should pass this exact boundary; a different HRESULT from a later stage is new evidence, not recurrence of NS_E_AUDIODEVICE_BUSY.

Technical references

• DirectShow audio capture.
• DirectShow filter graph.