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WINCODEC_ERR_INTERNALERROR
WINCODEC_ERR_INTERNALERROR belongs to an internal WIC component failure. A WIC component detected an internal failure not represented by a more specific codec error.
What the status establishes
WIC operations can cross component discovery, stream access, metadata handlers, pixel conversion, decoder or encoder implementation, and COM callbacks. An internal status is useful only after format-specific and lower Win32 failures have been excluded and the responsible component has been identified.
codec implementation, metadata handler, pixel converter, or WIC infrastructure immediately before the catch-all mapping.
Evidence to preserve
- Component CLSID and interface method
- Image hash, frame index, pixel format, and metadata path
- Stream behavior and thread/apartment
- Inner exception, Win32 error, or component trace
Reduce the scenario safely
Separate decoder initialization, frame acquisition, pixel copy, metadata traversal, and conversion into individual calls. Preserve the same image bytes and component CLSID while removing one stage at a time.
- Use a minimal file and operation that still reproduces.
- Compare another WIC codec for the same format when available.
- Remove metadata traversal to separate pixel and metadata paths.
- Test decoder initialization and frame decode as separate phases.
Keep neighboring failures separate
BADIMAGE and BADSTREAMDATA point to input-format problems; INTERNALERROR should trigger investigation of component state and nested diagnostics first. Do not overwrite or transcode the only failing sample before preserving its exact bytes and hash.
Technical references
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