pavucontrol I have my output set to
Digital Surround 5.1(IEC958/AC3)
When I open a video with
VLC (my preferred option) OR
GNOME Media player I hear no sound.
VLC is configured to use
pulseaudio as the audio device.
I have noticed that if I go to the
System Settings/Sound/test sound dialog, sometimes I hear a female voice saying 'Front left', 'Front right' etc, sometimes a 'bloop' noise from each speaker. Either way it causes VLC audio to kick into life on all 6 speakers.
If I then then skip a chapter, skip forward, or restart
VLC I am back where I started - no sound.
Could someone explain for me what is happening, and also how I might configure my system reliably to output 5.1 Surround sound to its optical cable?
Diagnostics can be found here