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NS_E_PROPERTY_READ_ONLY
NS_E_PROPERTY_READ_ONLY: evidence, boundary and retest
The useful reading of this result (0xC00D32CC) is not “media failed” but the selected metadata property exists but cannot be modified through this provider. This places the failure at the property read only metadata check and narrows the evidence to collect before another attempt changes state.
Windows Media metadata can be file-level or stream-level and can come from an ASF header, computed attributes, an online/cache provider or a format-specific metadata handler. Read capability, edit capability, locale and query schema are independent properties. In the case of this result, preserve the earliest lower-level result because wrappers can map several different causes to the same HRESULT.
Attribute, schema and locale evidence
| Capture | Why it matters |
|---|---|
| Owning call | Record the API method, object identity, thread or callback and timestamp for the property read only metadata check. |
| Decisive values | file or content identifier, metadata provider, stream number, attribute name and type, locale, read/edit capability and the first metadata API result. |
| Object generation | Note when the reader, writer, graph, URL object, streaming session or metadata provider was created; stale state can reproduce this result after configuration has changed. |
| First nested result | Keep the earliest codec, COM, socket, DNS, parser or provider status before this result; later UI messages are less specific. |
| Comparison case | Use one known-good resource that exercises the same the property read only metadata check while changing only the rejected precondition. |
Failure anatomy
The property read only metadata check is reached when the selected metadata property exists but cannot be modified through this provider. The caller must not assume that the next filter, packet, session or metadata state exists after it.
Use read the same item through the provider, then attempt one documented writable attribute in a copied local file rather than the original source as the negative control. A later HRESULT means this checkpoint was cleared and the new result belongs to a different stage.
Nearby results are not interchangeable
Main distinction: metadata lookup, schema validation and edit capability are separate checkpoints even when the same attribute is involved.
| Nearby HRESULT | How to compare it |
|---|---|
NS_E_USE_FILE_SOURCE | Compare the owning API and first rejected value; it belongs to a neighboring checkpoint, not automatically to the same cause as it. |
NS_E_PROPERTY_NOT_FOUND | Use object state and operation order to decide which code is authoritative when both appear in one trace. |
NS_E_TABLE_KEY_NOT_FOUND | Retain it separately if it appears only after the condition has cleared. |
Read-only metadata experiment
- Log
0xC00D32CC, it, the exact operation and the first failure time. - Preserve file or content identifier, metadata provider, stream number, attribute name and type, locale, read/edit capability and the first metadata API result.
- Do not reuse a graph, session, reader or metadata object created before the relevant configuration or resource changed.
- Perform one isolated test: read the same item through the provider, then attempt one documented writable attribute in a copied local file rather than the original source.
- 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 property read only metadata check is fixed.
- Confirm the expected next state and retain any new HRESULT as a separate downstream result.
Interpret the provider response
| Retest result | Interpretation |
|---|---|
| The identical call still returns the code | The values governing the property read only metadata check are unchanged, or the caller is still using an older object generation. |
| A fresh object succeeds | Lifetime or cached state contributed to it; correct object recreation instead of applying a machine-wide workaround. |
| The call advances to another HRESULT | the property read only metadata check boundary was cleared. Diagnose the new code at its own format, graph, URL, network or metadata stage. |
| Only one resource fails | The evidence favors content, URL, publishing point, stream, attribute or object-specific state rather than a global outage. |
Misleading actions
- rewriting the entire file header before proving that the active provider supports edits.
- Do not erase the first occurrence by repeatedly retrying; callbacks and reconnects can replace the useful state with a later wrapper error.
- Do not publish credentials, protected-content material or complete private URLs. Record redacted identifiers, lengths, hashes and protocol fields needed to reproduce the property read only metadata check.
Technical references
- Windows Media metadata features
- Retrieving metadata attributes
- Setting metadata attributes
- Metadata editor object
- Microsoft HRESULT registry
Treat it as resolved only when the same API path crosses this checkpoint; success through a different player or cached copy is merely supporting evidence.
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