Play only Sound from \"Line in\" via DLNA?

As the title suggests, would it be possible to Stream only the audio that is playing into my PC over the “Line in” Input?

hello. I would alos like to have an answer for this question. Is this ossible. We use it for our church. so Mothers with Babys can listen the speech over the smartphone in our cafe.

I found it possible to just mute everything else in the volume mixer from Windows.
Only thing that bothers meine now is the big delay between the source and the reciever but that should not be a problem in your case