Thread: [Conversion Output] KFX Output
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Old 09-02-2017, 10:48 PM   #258
jhowell
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Posts: 7,091
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Join Date: Nov 2011
Location: Charlottesville, VA
Device: Kindles
Quote:
Originally Posted by wanderson View Post
Kindle Previewer error: Exception in thread "main" com.amazon.kcf.conversion.image.e.a: KindleImageConverter Failed with exit code : -1073741819error String: IMG_CONV_UNKNWON_ERROR

Any insight into what is happening, and what I can do to tweak the ePub?
As part of the conversion process the Kindle Previewer converts all of the images in the book to JPEG. The program that does this (KindleImageConverter) has bugs that cause it to fail with some specific images, but not every time. The plugin detects when these failures occur and retries the conversion a few times and it is often successful eventually.

This is a long-standing bug in the Kindle Previewer. You may be able to work around the problem by replacing the images, if a book fails this way consistently.

IMG_CONV_UNKNWON_ERROR is one of the many misspelled and grammatically incorrect error message produced by the Kindle Previewer. Normally these messages are not shown to users so Amazon hasn't bothered to clean them up. The plugin captures them and makes them visible to the user.
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