HRESULT 0xC00D3AA1 (MF_E_ASF_DROPPED_PACKET): meaning and diagnosis

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ASF packet loss was detected, creating a discontinuity in the parsed media stream.

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MF_E_ASF_UNSUPPORTED_STREAM_TYPE	MF_E_NO_EVENTS_AVAILABLE

MF_E_ASF_DROPPED_PACKET

MF_E_ASF_DROPPED_PACKET records packet loss at the ASF container level. Microsoft notes that splitter discontinuities are commonly caused by dropped network packets, corrupt file data, or switching source streams.

Trace packet continuity, not decoder output first

For network input, log packet boundaries and transport sequence/offset information before bytes enter ParseData.
For files, compare the failing byte range with a fresh copy and check for truncation or sparse reads.
Inspect MFSampleExtension_Discontinuity on the first sample produced after the break.

A decoder may later report artifacts or missing references, but those are downstream symptoms. Preserve the first ASF HRESULT and the byte offset where continuity was lost. FFmpeg's ASF demuxer is also useful as an independent parser when deciding whether the defect is in the file or the application's buffering path.

Microsoft: splitter discontinuity handling · FFmpeg ASF demuxer source · Microsoft: GetNextSample errors

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