Github user jskora commented on the pull request:
https://github.com/apache/nifi/pull/252#issuecomment-198427593
I don't love all the attribute names, I might have come up with a cleaner
taxonomy myself. But, letting Tika handle it leverages the work done on
another active Apache project by people familiar with the formats.
Incorporating Tika was a little harder than writing custom code to only handle
WAV files would have been, but it provided significantly more functionality.
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