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NS_E_USE_FILE_SOURCE
What NS_E_USE_FILE_SOURCE means at its owning API
When this result (0xC00D32C9) appears, the first blocked transition is the metadata or media operation must fall back to the file source instead of the current provider. In practice, the failing metadata operation must be reconstructed from the same URL, stream, object generation and call sequence.
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 in the diagnostic record. Read capability, edit capability, locale and query schema are independent properties when isolating this failure. In the case of this result, preserve the earliest lower-level result because wrappers can map several different causes to the same HRESULT at this checkpoint.
Read-only metadata experiment
- Log
0xC00D32C9, this result, 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: route the request through the file source explicitly and compare the result with the provider that requested fallback before retrying.
- 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 that metadata stage is fixed.
- Confirm the expected next state and retain any new HRESULT as a separate downstream result when isolating this failure.
What completed, and what did not
Before the reported boundary, earlier setup may have succeeded, but the metadata or media operation must fall back to the file source instead of the current provider was not completed. This is why logs should preserve both the last successful call and this result.
The targeted comparison is route the request through the file source explicitly and compare the result with the provider that requested fallback. It changes the disputed precondition without changing the media identity or unrelated machine settings.
Attribute, schema and locale evidence
| Capture | Why it matters |
|---|---|
| Owning call | Record the API method, object identity, thread or callback and timestamp for the metadata operation. |
| Decisive values | File or content identifier, metadata provider, stream number, attribute name and type, locale, read/edit capability and the first metadata API result in the diagnostic record. |
| Object generation | Note when the reader, writer, graph, URL object, streaming session or metadata provider was created; stale state can reproduce it after configuration has changed. |
| First nested result | Keep the earliest codec, COM, socket, DNS, parser or provider status before it; 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. |
Interpret the provider response
| Retest result | Interpretation |
|---|---|
| The identical call still returns the code | The values governing the original request 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 recorded metadata state boundary was cleared. Diagnose the new code at its own format, graph, URL, network or metadata stage in the 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 this failure. |
Misleading actions
- Deleting metadata caches or tags before preserving the provider, attribute key, type and locale that produced the result at this checkpoint.
- 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 original boundary.
Nearby results are not interchangeable
Main distinction: metadata lookup, schema validation and edit capability are separate checkpoints even when the same attribute is involved before retrying.
| Nearby HRESULT | How to compare it |
|---|---|
NS_E_END_OF_PLAYLIST | playlist enumeration has reached the terminal position rather than failing to open media |
NS_E_PROPERTY_NOT_FOUND | The metadata provider rejected this operation checkpoint |
NS_E_PROPERTY_READ_ONLY | The metadata provider rejected this operation checkpoint |
Technical references
- Windows Media metadata features
- Retrieving metadata attributes
- Setting metadata attributes
- Metadata editor object
- Microsoft HRESULT registry
Retain the post-fix trace so a later pipeline result is not mistaken for recurrence of this boundary.
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