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WINCODEC_ERR_STREAMWRITE
WINCODEC_ERR_STREAMWRITE means that a WIC codec failed while writing image data or metadata to its output stream. The underlying problem can be a closed stream, permission failure, full storage, a short write, or an IStream implementation that rejects the requested operation.
What to check
- Inspect the underlying stream or file error in addition to the WIC HRESULT.
- Keep the output stream alive and writable until the encoder and all frames are committed.
- Write to a temporary file and publish it atomically only after a successful commit to avoid leaving readers with a partial image.
For in-memory streams, verify capacity growth and error handling rather than assuming writes cannot fail.
Microsoft: WIC encoding overview
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