Write diagnostics to stderr instead of stdout for using exempi -g in a pipe
exempi -g 'fwl:LocalCaption' test.jpg writes processing file test.jpg to stdout which mixes with the value that
-g returns. The processing file ... message should either be removed or should be written to stderr or maybe exempi could have a
-q quiet option to suppress all messages. I am using exempi 2.4.5 on Fedora 30 x86_64.
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