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Old 02-04-2025, 10:04 AM   #1
Iloveeread
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Text selection in pdf is not working for Sanskrit

I am trying to select text on a Sanskrit PDF, and I get the following error in the images attached below. Please check and tell.
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Old 02-04-2025, 03:22 PM   #2
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Tracked in https://github.com/koreader/koreader/issues/12738, not yet resolved.
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Old 02-04-2025, 03:34 PM   #3
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This is a known and open bug, as reported here:

https://github.com/koreader/koreader/issues/12738

It occurs when there is no text-layer and KOReader attempts to do OCR but can't find the tessdata files. You can prevent the crashes by copying the 'eng.traineddata' file to your koreader/data/tessdata folder. It is available here for example: https://github.com/tesseract-ocr/tessdata

If you actually want to use OCR on your Sanskrit book, then you will also need to get the 'san.traineddata' file and copy it to the same folder. In addition, you will need to add the "san" language code in your koreader/defaults.custom.lua configuration file, under DKOPTREADER_CONFIG_DOC_LANGS_CODE = . (You will of course also need to have a Sanskrit dictionary installed and I'm not sure how accurate/useful the OCR will be.)

You can find more information here: https://github.com/koreader/koreader...ionary-support
Section: "Dictionary lookups in scanned pages"
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Old 02-06-2025, 05:33 AM   #4
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Similar issues with dictionaries for Telugu and Sanskrit. I have added the required dictionaries from the inbuilt KOreader download option. Fonts are not showing up even if I add custom fonts. Please see the image below.
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Old 02-06-2025, 06:36 AM   #5
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You mean as per Settings → Device → Additional UI fallback fonts?
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Old 02-06-2025, 06:47 AM   #6
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Yes. I FIXED the previous issue by using a PDF without images and with prebuilt OCR. This is a similar issue which occurs even in text-selectable PDFs and epubs.
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Old 02-06-2025, 12:26 PM   #7
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The issue you originally had was caused by OCR'ing a PDF.

The issue you currently have (with PDF's with a text layer) is that the font you're using in the UI (the dictionary lookup) doesn't contain the glyphs.

The solution provided by Frenzie is what you need (plus a font with the glyphs, not sure if we provide coverage for telugu or sanscript, we ship devanagari)
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Old 02-06-2025, 02:33 PM   #8
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Deleted this reply. Will check and come back.

Last edited by Iloveeread; 02-06-2025 at 02:37 PM.
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Old 02-06-2025, 09:07 PM   #9
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xref: https://github.com/koreader/koreader/issues/13218
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