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How to check from the command line on a remote machine (ssh) if the line input of sound card has an audio signal ?

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up vote 2 down vote accepted

As you seem to be using ubuntu:

arecord -vv /dev/null

should display you a set of statistics plus a moving bar of hashes that goes right or left according to the input level of the sound input.

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as the last line I have this: #+ | 00% It means that I have no input? Right? – Sebtm Nov 26 '09 at 17:02
The bar refers to the pink (microphone) or the light blue (line-in) connector on sound card? – Sebtm Nov 26 '09 at 17:11
Correct, you have no input on the line. AFAIK, the bar refers to whatever you have configured via alsa as input channel. You can check your settings still with CLI by issuing the command alsamixer. The TAB key allows you to switch between panes, arrows navigate and change values. – mac Nov 26 '09 at 19:20
Really Thanks. In alsamiker I have the input line set to 0, now I have increased the value. Tomorrow I try to insert the jack into the input line, now in alsamixer Mic = CAPTUR, so I think I'm using the microphone connector instead of the input line. – Sebtm Nov 26 '09 at 20:15
The 'thank you upvote' can come from an innocent by-stander as well... – Shannon Nelson Nov 28 '09 at 7:47

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