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1. Open a Terminal (Under Applications - Utilities).
2. You'll have to navigate to where your Serviio is installed (I'm presuming /Applications, if not, change accordingly):
type “cd /Applications/Serviio.app/Contents/MacOS”
3. Type “./ffmpeg -i ~/Movies/filename.avi” (of course change filename accordingly ) (~ is a shortcut for your home directory, BTW, eg. /Users/john/)
4. Select the output, push Cmd-C and then you can paste it in a mail, or forum post.