What does HRESULT 0xC00D3E9D (MF_E_CANNOT_FIND_KEYFRAME_SAMPLE) mean?

MF_E_CANNOT_FIND_KEYFRAME_SAMPLE

The practical meaning of this HRESULT

MF_E_CANNOT_FIND_KEYFRAME_SAMPLE (0xC00D3E9D) is a failure result from Windows Media Foundation. The generated section above already contains the platform message; the useful extra information is that this result isolates the requested seek, trim, index, or sample search could not locate a clean-point video sample.

The producer is the source, parser, or index-assisted search that scans for a key frame, so diagnosis should begin with that object and its state rather than with a broad reinstall or an unrelated codec change. A representative occurrence is a damaged or unusually long-GOP stream has no clean point in the requested interval.

Checkpoint map

Data to preserve

Collect MF_E_CANNOT_FIND_KEYFRAME_SAMPLE data before automatic retries, Player navigation, device reconnection, source shutdown, or setup rollback destroys it. For MF_E_CANNOT_FIND_KEYFRAME_SAMPLE, the minimum useful record contains the exact returning API, object identity, input identity, current lifecycle state, and the first lower-level failure.

A MF_E_CANNOT_FIND_KEYFRAME_SAMPLE trace must not store credentials, license payloads, private keys, authorization headers, or unrelated library contents. For MF_E_CANNOT_FIND_KEYFRAME_SAMPLE, record identifiers, hashes, lengths, status values, and redacted endpoint information sufficient to correlate the event.

A narrow diagnostic run

1. Reproduce once with tracing enabled and preserve 0xC00D3E9D before any fallback.
2. Verify the decisive observation: target time, search direction and range, MFSampleExtension_CleanPoint values, stream selection, index availability, and first/last sample times.
3. Run the controlled comparison: expand the search range or inspect samples around the target while logging clean-point attributes.
4. Return to the MF_E_CANNOT_FIND_KEYFRAME_SAMPLE baseline, apply the supported correction, and create a new object generation if the old one entered a terminal state.
5. Repeat the MF_E_CANNOT_FIND_KEYFRAME_SAMPLE test until the original call advances past this checkpoint and the expected output is validated.

Distinguish the neighboring failures

The codes compared with MF_E_CANNOT_FIND_KEYFRAME_SAMPLE can lead to the same user-facing “cannot play,” “operation failed,” or “setup failed” dialog. They remain technically different. Here, MF_E_NO_INDEX reports missing index data; this code can occur even when scanning or an index exists but yields no key frame.

Finish with a repeatable fix

For this occurrence, build or repair the index, seek to an earlier clean point, or use a stream with valid key-frame signaling. For MF_E_CANNOT_FIND_KEYFRAME_SAMPLE, avoid generic cleanup until the original artifact is copied and the producing state is known. A destructive reset during MF_E_CANNOT_FIND_KEYFRAME_SAMPLE diagnosis can remove evidence while leaving the actual policy, device, network, format, or lifecycle error unchanged.

Verification of MF_E_CANNOT_FIND_KEYFRAME_SAMPLE must use the same input and action that failed. Confirm the expected state transition and check that the workflow does not merely substitute another error after MF_E_CANNOT_FIND_KEYFRAME_SAMPLE disappears.

Authoritative references

• Media Foundation architecture — reference used for the MF_E_CANNOT_FIND_KEYFRAME_SAMPLE checkpoint.
• Media Foundation error codes — reference used for the MF_E_CANNOT_FIND_KEYFRAME_SAMPLE checkpoint.
• ASF media source — reference used for the MF_E_CANNOT_FIND_KEYFRAME_SAMPLE checkpoint.
• Sample attributes and clean points — reference used for the MF_E_CANNOT_FIND_KEYFRAME_SAMPLE checkpoint.

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