Use ExifTool instead of Exiv2 to read photo metadata and extract thumbnails.
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The default is to use Exiv2, relying on ExifTool only when Exiv2 does not support
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the file format being read.
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Exiv2 is fast, accurate, and almost always reliable, but it crashes when extracting
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metadata from a small number of files, such as DNG files produced by Leica M8
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cameras.