Audio under-runs on dial_tone.py (even when using plughw:0, 0)

GNU Radio
1

Hi,

I’m helping a mate get GNURadio 3.2 running on an Ubuntu machine. As a
quick
sanity check I run dial_tone.py and to my surprise it generates a stream
of
“aU” audio under-run warnings and clicking noises from the speaker. I’ve
used the “-O plughw:0,0” option because that’s always worked for me when
there are rate mismatches but it gives exactly the same result. The only
odd
thing I can think of is that this is running in a VM but otherwise I am
at a
loss to understand what’s happening. Anyone clues?

Many thanks,

Steve

2

On Mon, Jul 27, 2009 at 02:12:34PM +1000, Steve G. wrote:

Many thanks,
Steve

What kind of VM?
What’s the host OS?
Does any other audio output work in the guest?

Eric

3

What kind of VM?

VMware Fusion, latest version.

What’s the host OS?

OS X 10.5.7

Does any other audio output work in the guest?

All audio and video playback works fine in the VM - I can even capture
audio
using the examples but get audio under-run on output.

Thanks for helping. I’m trying to sort it out via an SSH link and am
befuddled that such a simple app plays up.

4

What’s the host OS?

OS X 10.5.7

I had absolutely no luck getting any kind of decent performance with
parallels or VMware when using gnuradio/ubuntu VMs under os x(10.4).
I haven’t tried tried since I got my new laptop, but if you are set on
using your mac machine as a development box then I would suggest dual
booting if it’s an intel mac or just installing gnuradio in the os x
environment.

Jason