Arian Maleki d8cee15f32 Optimize exiftool calls by adding an ExifTool singleton in pyexiftool library (#352)
This fix results in a 10x performance improvement [1] enabling a single exiftool subprocess to elimate spawing exiftool for each image.

Closes #350 #347 

[1] https://github.com/jmathai/elodie/issues/350#issuecomment-573412006
2020-01-13 23:04:33 -08:00
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