[CentOS] USB audio on Centos-7

Sat Sep 30 01:02:08 UTC 2017
Fred Smith <fredex at fcshome.stoneham.ma.us>

On Wed, Sep 27, 2017 at 12:08:59PM -0400, Fred Smith wrote:
> On Wed, Sep 27, 2017 at 02:06:35PM +1000, Kahlil Hodgson wrote:
> > Most of the useful audacity stuff is in their wiki:
> > 
> > http://wiki.audacityteam.org/wiki/USB_mic_on_Linux
> > 
> > seems like a good place to start.
> thanks, that probably is a good place to start. some of that
> may be pretty old, but I'm checking it out. One could wish it
> wasn't quite so terse, in spots.
> Fred

OK, I spent several hours messing with it, including trying the
things shown at the audacity URL above. But at that point, it was
as if there was no input device there. gave up, went to bed.

next day I noticed that no audio played at all even without the 
USB device, not from a DVD, nor a MP3 file, nor from any web
video. so I figured some bit of hardware had gotten into some
"I'm gonna play dead" state, so I did a full power off and reboot,
after which I had normal audio again.

so I plugged in the USB device again and fed some audio into its
line in. fired up Audacity and was able to select the USB device
as its input, and it records!

the recording, when played back, is kinda jumpy, as if bits of
it got lost on record, but otherwise doesn't sound too bad.
Wondering if I need to try a realtime kernel... (or maybe I 
should just pause the Folding At Home client while recording...
there's a thing to try! :)

thanks for the hint!


---- Fred Smith -- fredex at fcshome.stoneham.ma.us -----------------------------
  "And he will be called Wonderful Counselor, Mighty God, Everlasting Father,
  Prince of Peace. Of the increase of his government there will be no end. He 
 will reign on David's throne and over his kingdom, establishing and upholding
      it with justice and righteousness from that time on and forever."
------------------------------- Isaiah 9:7 (niv) ------------------------------