What does HRESULT 0xC00D11A1 (NS_E_WMP_CODEC_NEEDED_WITH_4CC) mean?

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NS_E_WMP_WMDM_FAILURE	NS_E_WMP_CODEC_NEEDED_WITH_FORMATTAG

NS_E_WMP_CODEC_NEEDED_WITH_4CC

Diagnosing NS_E_WMP_CODEC_NEEDED_WITH_4CC in the Windows Media Player playback path

NS_E_WMP_CODEC_NEEDED_WITH_4CC (0xC00D11A1) is returned when a video stream identifies its decoder by a FourCC for which no usable codec was found.

The FourCC is the primary discriminator for this result. Record it together with the video subtype and installed decoders, then verify decoder availability without simultaneously changing the source or renderer.

Controlled playback comparison

Freeze the current object state and collect FourCC bytes, BITMAPINFOHEADER, source filter output type, installed decoder CLSIDs and graph error.
Reproduce this result once without automatic retries or fallback applications.
Change only one precondition: test a small file carrying the same FourCC and inspect which decoder candidates accept the exact media type.
Compare the first nested status and next Player event with the failed run.
After testing it, restore the original configuration if the change was diagnostic only.

Actions that obscure the cause

installing a codec based only on the filename extension.

Technical references

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