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NS_E_CODEC_DMO_ERROR
What NS_E_CODEC_DMO_ERROR means at its owning API
When NS_E_CODEC_DMO_ERROR (0xC00D0BDA) appears, the first blocked transition is a codec hosted through the DMO path returned an operational failure. In practice, the failing media-format operation must be reconstructed from the same URL, stream, object generation and call sequence.
Windows Media Format separates the compressed stream profile from the raw input format and from the decoded output selected by a reader when isolating this failure. 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 at this checkpoint. In the case of NS_E_CODEC_DMO_ERROR, preserve the earliest lower-level result because wrappers can map several different causes to the same HRESULT.
A controlled media-format test
- Log
0xC00D0BDA,NS_E_CODEC_DMO_ERROR, the exact operation and the first failure time during a controlled retest. - Preserve codec CLSID or subtype, installed binary version, selected input and output media types, first codec HRESULT and the sample timestamp where processing stopped.
- Do not reuse a graph, session, reader or metadata object created before the relevant configuration or resource changed before retrying.
- Perform one isolated test: feed a minimal known-good sample using the same negotiated media type and capture the first codec-specific failure before the SDK maps it in the diagnostic record.
- 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 format stage is fixed.
- Confirm the expected next state and retain any new HRESULT as a separate downstream result at this checkpoint.
What completed, and what did not
Before the reported boundary, earlier setup may have succeeded, but a codec hosted through the DMO path returned an operational failure was not completed. This is why logs should preserve both the last successful call and NS_E_CODEC_DMO_ERROR.
The targeted comparison is feed a minimal known-good sample using the same negotiated media type and capture the first codec-specific failure before the SDK maps it. It changes the disputed precondition without changing the media identity or unrelated machine settings before retrying.
Profile and sample evidence
| Capture | Why it separates NS_E_CODEC_DMO_ERROR |
|---|---|
| Owning call | Record the API method, object identity, thread or callback and timestamp. |
| Decisive values | Codec CLSID or subtype, installed binary version, selected input and output media types, first codec HRESULT and the sample timestamp where processing stopped 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 NS_E_CODEC_DMO_ERROR after configuration has changed. |
| First nested result | Keep the earliest codec, COM, socket, DNS, parser or provider status before NS_E_CODEC_DMO_ERROR; later UI messages are less specific. |
| Comparison case | Use one known-good resource that exercises the same media-format check while changing only the rejected precondition. |
How to read the next HRESULT
| Retest result | Interpretation for NS_E_CODEC_DMO_ERROR |
|---|---|
| The identical call still returns the code | The values governing the format operation are unchanged, or the caller is still using an older object generation. |
| A fresh object succeeds | Lifetime or cached state contributed to NS_E_CODEC_DMO_ERROR; 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
- Installing unrelated codec packs before preserving the actual codec CLSID and first internal failure.
- Do not erase the first
NS_E_CODEC_DMO_ERRORoccurrence by repeatedly retrying; callbacks and reconnects can replace the useful state with a later wrapper error during a controlled retest. - Do not publish credentials, protected-content material or complete private URLs. Record redacted identifiers, lengths, hashes and protocol fields needed to reproduce the recorded format state.
Nearby results are not interchangeable
Main distinction: this result belongs to format, profile or sample processing, not merely to file-name or network resolution in the diagnostic record.
| Nearby HRESULT | How to compare it |
|---|---|
NS_E_INVALID_EDL | the edit decision list contains invalid timing, ordering or source-range information |
NS_E_DATA_UNIT_EXTENSION_TOO_LARGE | Per-sample extension data exceeds the size that can be attached to the sample |
NS_E_FEATURE_DISABLED_BY_GROUP_POLICY | Administrative policy blocks the feature before the media operation is attempted |
Technical references
- Windows Media Format SDK overview
- Input, stream and output formats
- Profiles
- Windows Media SDK objects
- Microsoft HRESULT registry
Retain the post-fix trace so a later pipeline result is not mistaken for recurrence of this boundary during a controlled retest.
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