[PLUG] Need Assist with Audio on CentOs 6.6

Kyle Kneitinger kylejkneitinger at gmail.com
Tue Aug 4 04:03:26 UTC 2015


Hi Steve!

I'm not on Cent OS, or doing any internet streaming, but I'm a musician and
programmer of digital musical instruments and have a good knowledge of
JACK.  JACK really is the greatest thing about Linux audio, but there are a
lot of subtleties that can trip you out along the way.  Once you find the
settings that work for you, it can be quite nice to work with, but finding
those settings can be hard.  I don't know what issues you're having, it
would be helpful if you talked about small precise issues (i.e. "I can't
get JACK to connect to this stereo effects unit"), and not just higher
level issues.

Some tips I've encountered along the way:
- qjackctl is very smooth.  I recommend it if you're not using it already.
- The dbus version of the jack daemon is far more reliable and adaptive.
In qjackctl, there is an option that says something like "Enable dbus
interface".  You can find out if you have the dbus version of jack
installed if the "jack_control" command exists in the terminal.
- If latency is not a huge issue, higher buffer sizes are more reliable and
use less cpu.  Starts with very conservative settings, and increase bitrate
and decrease buffer size from there if you want lower latencies and higher
quality.
- If that red number appears in the qjackctl display, that means you have
an "xrun", or dropped sample.  This is usually indicative of settings too
intense for your hardware.

I've spent a great deal of time loathing JACK, until working through it and
now loving JACK.  It is a bit finicky, but it is a fantastic piece of
software once it is configured.  Let me know anything I can help you with!

- Kyle Kneitinger

On Mon, Aug 3, 2015 at 8:28 AM, Steve Atkins <fsradio at comcast.net> wrote:

> Hello,
>
> Just joined the group today for some guidance on my internet radio
> project.  If there are pro audio folks currently streaming to the net
> via Jack -> processing (stereo_tool) -> shoutcast stream server, I am
> looking for tutorials or previous solutions to a specific problem with
> this procedure.
>
> Google only goes so far, and so far not addressing this need.  This is
> apparently a trivial matter in the debian world.  I'm using a free
> CentOs distro supposedly designed for this purpose, but Jack's not
> cooperating (among other things).
>
> As you may have gathered, I'm new enough to linux to be dangerous but
> willing to learn
>
> Many thanks for any insight.
>
> Steve
> West Linn
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