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3 February 2026
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m+36
Created page with "'''mutool glyph index error''' is an issue that occurs when using the mutool command from the MuPDF toolset to process PDF files, resulting in text extraction failure due to abnormal font glyph index mapping. This problem is commonly found in scanned documents processed through Optical Character Recognition (OCR). __TOC__ == Problem Description == When mutool processes certain PDF files, it generates the following error message: <pre>warning: FT_Get_Advance(HiddenHor..."
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