FFmpeg not seen from Minimstreamer in Apple Silicon

[simoncn]

On further investigation, application packages on the Mac need to specify their own PATH. The PATH specified by the MinimServer package doesn't include /opt/homebrew/bin.

As it is simple for the user to specify the full path in the stream.converter property, I don't think this needs to be changed. I will add something to the Stream converter program section of the MinimStreamer user guide to explain this.