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NS_E_ASSERT
What NS_E_ASSERT tells you
The result NS_E_ASSERT (0xC00D00CB) means Windows Media Services hit an internal assertion and deliberately surfaced the assertion failure. The name is useful only when tied to the object and state that produced it; neighboring HRESULTs in the same subsystem can represent later stages.
Build a minimal reproduction
Preserve the assertion text if logged, source/module version, call stack or dump, server role, request ID, and the operation immediately preceding the assertion.
Keep those inputs stable while testing one prerequisite at a time. Reproduce on the same build with minimal configuration changes and compare against a patched/current server build. Do not treat an assertion as a normal administrator input error.
References
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