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WINCODEC_ERR_CODECNOTHUMBNAIL
WINCODEC_ERR_CODECNOTHUMBNAIL means that the selected WIC codec does not support returning an embedded thumbnail for this image. A thumbnail is optional container or frame data; it is not equivalent to a scaled version of the decoded pixels.
Recommended fallback
- First check whether the format exposes a thumbnail on an individual frame rather than at decoder level.
- When no embedded thumbnail exists, decode the relevant frame and create a scaled bitmap with a WIC scaler or application image pipeline.
- Do not classify the source file as corrupt solely because it lacks a thumbnail.
Availability varies by container and codec implementation, even for otherwise valid images.
Microsoft: WIC decoding overview
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