I use centos 7.1. What application can I use to record audio input (not microphone) from sound adapter? For example I connect TV sound output to PC sound card input.
You can use
Audacity for that. In
Audacity, you can select what you wish to use as input.
So your input would be visible here and you can select that. Moreover, I think it would be detected as Microphone only, nothing different. In that case, any other software might also do.