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NS_E_AUDIO_CODEC_ERROR
NS_E_AUDIO_CODEC_ERROR in a format, graph or streaming trace
For NS_E_AUDIO_CODEC_ERROR (0xC00D0BC3) the decisive boundary is an installed audio codec failed after selection rather than being absent. Diagnose the failing media-format operation directly and avoid inferring the cause only from the visible playback symptom.
Windows Media Format separates the compressed stream profile from the raw input format and from the decoded output selected by a reader. 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. In the case of NS_E_AUDIO_CODEC_ERROR, preserve the earliest lower-level result because wrappers can map several different causes to the same HRESULT before retrying.
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_TAMPERED_CONTENT | integrity checks on protected media data or its protection metadata did not validate |
NS_E_AUDIO_CODEC_NOT_INSTALLED | No installed audio codec matches the requested compressed subtype |
NS_E_VIDEO_CODEC_NOT_INSTALLED | No installed video codec matches the requested compressed subtype |
Identify the selected audio codec
This result is broader than a Microsoft Audio component failure. Preserve the compressed subtype, instantiated codec CLSID, binary version and first codec error. A WMA-labelled file can select an unexpected component before retrying.
If the codec is enumerated but fails on a known-good sample of the same subtype, inspect initialization properties and dependencies in the diagnostic record. If no matching codec is enumerated, expect the more precise missing-codec result when isolating this failure.
Failure anatomy
that format stage is reached when an installed audio codec failed after selection rather than being absent. The caller must not assume that the next filter, packet, session or metadata state exists after NS_E_AUDIO_CODEC_ERROR.
Use feed a minimal known-good sample using the same negotiated media type and capture the first codec-specific failure before the SDK maps it as the negative control. A later HRESULT means this checkpoint was cleared and the new result belongs to a different stage.
A controlled media-format test
- Log
0xC00D0BC3,NS_E_AUDIO_CODEC_ERROR, the exact operation and the first failure time before retrying. - Preserve codec CLSID or subtype, installed binary version, selected input and output media types, first codec HRESULT and the sample timestamp where processing stopped 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: feed a minimal known-good sample using the same negotiated media type and capture the first codec-specific failure before the SDK maps it 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.
Profile and sample evidence
| Capture | Why it separates NS_E_AUDIO_CODEC_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 before retrying. |
| Object generation | Note when the reader, writer, graph, URL object, streaming session or metadata provider was created; stale state can reproduce NS_E_AUDIO_CODEC_ERROR after configuration has changed. |
| First nested result | Keep the earliest codec, COM, socket, DNS, parser or provider status before NS_E_AUDIO_CODEC_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_AUDIO_CODEC_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_AUDIO_CODEC_ERROR; correct object recreation instead of applying a machine-wide workaround. |
| 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 before retrying. |
| Only one resource fails | The evidence favors content, URL, publishing point, stream, attribute or object-specific state rather than a global outage in the diagnostic record. |
Misleading actions
- Installing unrelated codec packs before preserving the actual codec CLSID and first internal failure when isolating this failure.
- Do not erase the first
NS_E_AUDIO_CODEC_ERRORoccurrence by repeatedly retrying; callbacks and reconnects can replace the useful state with a later wrapper error at this checkpoint. - 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.
Technical references
- Windows Media Format SDK overview
- Input, stream and output formats
- Profiles
- Windows Media SDK objects
- Microsoft HRESULT registry
Treat NS_E_AUDIO_CODEC_ERROR 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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