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NS_E_ATTRIBUTE_READ_ONLY
NS_E_ATTRIBUTE_READ_ONLY: evidence, boundary and retest
The useful reading of NS_E_ATTRIBUTE_READ_ONLY (0xC00D0BD6) is not “media failed” but the caller attempted to modify an attribute whose value is owned or computed by the SDK. This places the failure at the attribute read only media-format check and narrows the evidence to collect before another attempt changes state.
Windows Media Format separates the compressed stream profile from the raw input format and from the decoded output selected by a reader while tracing the attribute read only path. The writer then packetizes samples, applies attributes and optional data-unit extensions, so failure at one boundary does not prove that the ASF container itself is unreadable during a controlled attribute read only retest. In the case of NS_E_ATTRIBUTE_READ_ONLY, preserve the earliest lower-level result because wrappers can map several different causes to the same HRESULT for evidence about attribute read only.
Profile and sample evidence
| Capture | Why it separates NS_E_ATTRIBUTE_READ_ONLY |
|---|---|
| Owning call | Record the API method, object identity, thread or callback and timestamp for the attribute read only media-format check. |
| Decisive values | object interface, attribute or property identifier, stream number, data type, mutability flags and the operation used to set or retrieve it in the attribute read only diagnostic record. |
| Object generation | Note when the reader, writer, graph, URL object, streaming session or metadata provider was created; stale state can reproduce NS_E_ATTRIBUTE_READ_ONLY after configuration has changed. |
| First nested result | Keep the earliest codec, COM, socket, DNS, parser or provider status before NS_E_ATTRIBUTE_READ_ONLY; later UI messages are less specific. |
| Comparison case | Use one known-good resource that exercises the same the 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 NS_E_ATTRIBUTE_READ_ONLY.
Use query the object capability and existing attribute type first, then perform the same operation on one documented writable property as the negative control before closing the attribute read only incident. A later HRESULT means this checkpoint was cleared and the new result belongs to a different stage in the attribute read only diagnostic record.
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 when isolating the attribute read only case.
| Nearby HRESULT | How to compare it |
|---|---|
NS_E_SDK_BUFFERTOOSMALL | Compare the owning API and first rejected value; it belongs to a neighboring checkpoint, not automatically to the same cause as NS_E_ATTRIBUTE_READ_ONLY. |
NS_E_INVALID_NUM_PASSES | Use object state and operation order to decide which code is authoritative when both appear in one trace while tracing the attribute read only path. |
NS_E_ATTRIBUTE_NOT_ALLOWED | Retain this result separately if it appears only after the NS_E_ATTRIBUTE_READ_ONLY condition has cleared. |
A controlled media-format test
- Log
0xC00D0BD6,NS_E_ATTRIBUTE_READ_ONLY, the exact operation and the first failure time for evidence about attribute read only. - Preserve object interface, attribute or property identifier, stream number, data type, mutability flags and the operation used to set or retrieve it before closing the attribute read only incident.
- Do not reuse a graph, session, reader or metadata object created before the relevant configuration or resource changed in the attribute read only diagnostic record.
- Perform one isolated test: query the object capability and existing attribute type first, then perform the same operation on one documented writable property when isolating the attribute read only case.
- 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.
- Confirm the expected next state and retain any new HRESULT as a separate downstream result while tracing the attribute read only path.
How to read the next HRESULT
| Retest result | Interpretation for NS_E_ATTRIBUTE_READ_ONLY |
|---|---|
| The identical call still returns the code | The values governing the attribute read only media-format check are unchanged, or the caller is still using an older object generation. |
| A fresh object succeeds | Lifetime or cached state contributed to NS_E_ATTRIBUTE_READ_ONLY; correct object recreation instead of applying a machine-wide workaround for evidence about attribute read only. |
| The call advances to another HRESULT | The the attribute read only media-format check boundary was cleared. Diagnose the new code at its own format, graph, URL, network or metadata stage in the attribute read only diagnostic record. |
| Only one resource fails | The evidence favors content, URL, publishing point, stream, attribute or object-specific state rather than a global outage when isolating the attribute read only case. |
Misleading actions
- changing several profile and codec settings at once, which hides the first incompatible field at the attribute read only checkpoint.
- Do not erase the first
NS_E_ATTRIBUTE_READ_ONLYoccurrence by repeatedly retrying; callbacks and reconnects can replace the useful state with a later wrapper error while tracing the attribute read only path. - Do not publish credentials, protected-content material or complete private URLs during a controlled attribute read only retest. Record redacted identifiers, lengths, hashes and protocol fields needed to reproduce the attribute read only media-format check.
Technical references
- Windows Media Format SDK overview
- Input, stream and output formats
- Profiles
- Windows Media SDK objects
- Microsoft HRESULT registry
Treat NS_E_ATTRIBUTE_READ_ONLY as resolved only when the same API path crosses this checkpoint; success through a different player or cached copy is merely supporting evidence before closing the attribute read only incident.
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