What does HRESULT 0xC00D0BD6 (NS_E_ATTRIBUTE_READ_ONLY) mean?

Status / error code:

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Constant name:

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Description:

An attempt was made to add, modify, or delete a read only attribute

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NS_E_INVALID_NUM_PASSES	NS_E_ATTRIBUTE_NOT_ALLOWED

NS_E_ATTRIBUTE_READ_ONLY

`NS_E_ATTRIBUTE_READ_ONLY`: diagnosis and verification

NS_E_ATTRIBUTE_READ_ONLY (0xC00D0BD6) means the caller attempted to modify an attribute whose value is owned or computed by the SDK.

Profile and sample evidence

Capture	Why it matters
Owning call	Record the API method, object identity, thread or callback and timestamp for the attribute read only media-format check.
Values to record	object interface, attribute or property identifier, stream number, data type, mutability flags and the operation used to set or retrieve it.
Comparison case	Use one known-good resource that exercises the same attribute read only media-format check while changing only the rejected precondition.

Failure anatomy

The attribute read only media-format check is reached when the caller attempted to modify an attribute whose value is owned or computed by the SDK. The caller must not assume that the next filter, packet, session or metadata state exists after it.

Nearby results are not interchangeable

Main distinction: read-only means the attribute exists but cannot be changed; not-allowed means that attribute is illegal in this context.

Nearby HRESULT	How to compare it
`NS_E_SDK_BUFFERTOOSMALL`	the caller-provided output buffer is smaller than the size reported by the SDK.
`NS_E_INVALID_NUM_PASSES`	the application used a preprocessing-pass sequence incompatible with the output mode.
`NS_E_ATTRIBUTE_NOT_ALLOWED`	the attribute is valid in the SDK but not legal for the selected media type or object.

A controlled media-format test

Log 0xC00D0BD6, the exact operation and the first failure time.
Perform one isolated test: query the object capability and existing attribute type first, then perform the same operation on one documented writable property.
Repeat through the same API and protocol path; a different player or local-copy test is useful only as a comparison, not as proof that the attribute read only media-format check is fixed.

Misleading actions

changing several profile and codec settings at once, which hides the first incompatible field.
Record redacted identifiers, lengths, hashes and protocol fields needed to reproduce the attribute read only media-format check.

Technical references

Treat it as resolved only when the same API path succeeds at this stage; success through a different player or cached copy is merely supporting evidence.

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