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exiftool batch mode

exiftool has a batch mode. If you pass the argument -stay_open True, exiftool accepts multiple commands. This is invaluable if you call exiftool from another program because you avoid the overhead of loading/unloading the program everytime. exiftool can also return data formatted as JSON, which python knows how to handle, allowing us to pass formatted data back and forth rather easily. An example of this all working together nicely is here.

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