The PVR takes the tv signal from the air and picks out the sound and video. It then passes this to myth where it's written to a nuv file.
When it's played back myth passes the nuv to the PVR350 and it decodes sound and video and send it out of it's cables.
Many people take the PVR sound and pipe it back into line-in where it passes through the card to it's outputs and onto the amp. OK, so we need to redirect this to the S/PDIF output, not the master output.
The FAQ, section 7.2 suggests
amixer set Line,0 75%,75% mute captur
which sets lin-in to 75%, mute's it and marks it for capture
then
amixer set Capture,0 100%,100% mute captur
I interpret as mute the capture channel (so it's not heard directly),
listen to the capture intput (line-in) at 100% and act as a capture
device (so Myth can read it)
However, further reading suggests that Myth doesn't do this for the PVRs - it just lets the line-in flow out of the master output.
Now Tom, I guess you have the line-in unmuted under alsamixer - and Myth controls the master volume thus allowing you to adjust the (analog) volume under mythtv?
Maybe something can run in parallel that captures line-in and feeds it to the pcm output? (which, depending on .asoundrc will be spdif or analog?) Maybe this can be put into Myth one day?
Please correct me if I'm wrong
David
