I’m using the command-line-version of KeyFinder – https://github.com/ibsh/is_KeyFinder/wiki#can-i-use-keyfinder-on-the-command-line to analyze the audio files and get the main musical key back. The script generates informations which it returns through the error stream, here is an example:

Script /Users/me/Desktop/echoparam.sh returned error code 0
file=/Users/me/Music/Some Album/09-The Plumes.flac
with error:
Decoder prepared for /Users/me/Music/Som Album/09-The Plumes.flac (s16, 44100)
Chroma vector for segment 0 of file /Users/me/Music/Som Album/09-The Plumes.flac: [15166560256, 14453726208, 29079306240, 14881610752, 48438411264, 11791857664, 21501777920, 30519826432, 17866635264, 24351498240, 12155273216, 39685640192]

The real key is returned through stdout, and I am able to store is as I want. The only problem here is the annoying popup reporting the script error (which is just additional information).

Is it possible to mute the error stream of the script? It would be nice to have an additional check box on the »Run External Script« Action: »Ignore Errors«