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NS_E_TOO_MANY_VIDEO
NS_E_TOO_MANY_VIDEO: the failing boundary
NS_E_TOO_MANY_VIDEO (0xC00D1B5D) means It is not possible to specify more than two video inputs. The important boundary is video input topology; do not replace this result with a broader “Windows Media failed” diagnosis.
What this result proves
This code proves that the session specifies more than two video inputs. 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 video inputs in the source group and their roles; reduce the configuration to the supported limit before profile/codec troubleshooting. 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_TOO_MANY_VIDEO.
Technical references
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