Subsonic is transcoding files even if nothing is playing

Hi,
Why does Subsonic transcode files with ffmpeg even if nothing is playing ? This eats up all my CPU.
Any idea how to switch this off ?
Regards
Jozsef
Why does Subsonic transcode files with ffmpeg even if nothing is playing ? This eats up all my CPU.
Any idea how to switch this off ?
Regards
Jozsef