No, it can't be the same as the input because the input of a dvb radio stream is mp2 (MPEG I, Layer 2) and Sonos needs AAC. Therefore I have to use transcoding which converts mp2 to aac. But it's also important that the output format is set to "Raw Audio Stream" because Sonos doesn't like containers that might contain video like mpegts or mkv. The "Raw audio stream" output format feature has been introduced in tvheadend about 2 years ago (version 4.1-2267 see also https://tvheadend.org/d/4230-how-to-stream-audio-from-tvheadend-to-sonos-or-any-other-audio-appliance).
That's why I'm curious if it's possible to configure this output option with ffmpeg manually and how it would look like (instead of "...-f mpegts pipe:1" which definetly won't work).
I would love to use it with plain tvheadend transcoding but unfortunately the CPU goes beyond 100% after some minutes, no matter which version, no. matter which Pi (2, 3b+), no matter whether running it natively or inside a docker container.
