Problem with Minimstreamer after update to 2.2

[Lio84]

There were nothing in stream.converter property before the update and it is still the case

- When I put ffmpeg in the stream converter property, the following message appears in red: "Converter not supported; correct highlighted value and retry"
I guess I should put a path but I cannot find the location of ffmpeg in the NAS

- When I put flac:wav in stream.transcode (alac:wav is removed) and nothing in stream.converter, Minimserver is running and the flac files are correctly transcoded in wav