| Previous | Next |
| NS_E_PROPERTY_NOT_SUPPORTED | NS_E_METADATA_FORMAT_NOT_SUPPORTED |
NS_E_SCHEMA_CLASSIFY_FAILURE
NS_E_SCHEMA_CLASSIFY_FAILURE: evidence, boundary and retest
The useful reading of this result (0xC00D32D4) is not “media failed” but the metadata document cannot be classified against a known schema. This places the failure at the failing metadata operation 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 for this diagnosis. In the case of this result, preserve the earliest lower-level result because wrappers can map several different causes to the same HRESULT before retrying.
Attribute, schema and locale evidence
| Capture | Why it matters |
|---|---|
| Owning call | Record the API method, object identity, thread or callback and timestamp. |
| Decisive values | Provider and schema identifiers, table or class name, query property, operator, key type, input value and the provider diagnostic returned before this HRESULT when isolating this failure. |
| 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 metadata check while changing only the rejected precondition. |
Failure anatomy
that metadata stage is reached when the metadata document cannot be classified against a known schema. The caller must not assume that the next filter, packet, session or metadata state exists after it.
Use enumerate the provider schema, issue the smallest valid query, and add the disputed key, property or operator only after that query succeeds as the negative control in the diagnostic record. A later HRESULT means this checkpoint was cleared and the new result belongs to a different stage when isolating this failure.
Nearby results are not interchangeable
Main distinction: metadata lookup, schema validation and edit capability are separate checkpoints even when the same attribute is involved at this checkpoint.
| Nearby HRESULT | How to compare it |
|---|---|
NS_E_INVALID_QUERY_PROPERTY | The metadata query references a property outside the searchable schema |
NS_E_PROPERTY_NOT_SUPPORTED | The metadata provider rejected this operation checkpoint |
NS_E_METADATA_FORMAT_NOT_SUPPORTED | No metadata handler supports the document or embedded metadata format |
Read-only metadata experiment
- Log
0xC00D32D4, it, the exact operation and the first failure time before retrying. - Preserve provider and schema identifiers, table or class name, query property, operator, key type, input value and the provider diagnostic returned before this HRESULT in the diagnostic record.
- Do not reuse a graph, session, reader or metadata object created before the relevant configuration or resource changed when isolating this failure.
- Perform one isolated test: enumerate the provider schema, issue the smallest valid query, and add the disputed key, property or operator only after that query succeeds at this checkpoint.
- 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 reported boundary 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 metadata operation 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 before retrying. |
| The call advances to another HRESULT | the original request boundary was cleared. Diagnose the new code at its own format, graph, URL, network or metadata stage when isolating this failure. |
| Only one resource fails | The evidence favors content, URL, publishing point, stream, attribute or object-specific state rather than a global outage at this checkpoint. |
Misleading actions
- Deleting metadata caches or tags before preserving the provider, attribute key, type and locale that produced the result.
- 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 for this diagnosis. Record redacted identifiers, lengths, hashes and protocol fields needed to reproduce the recorded metadata state.
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 in the diagnostic record.
Looking for a different code? Search another status or error code.