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[Discuss-gnuradio] Audio Overrun ( aOaOaO problem) - how to solve ?

From: Arturo Rinaldi
Subject: [Discuss-gnuradio] Audio Overrun ( aOaOaO problem) - how to solve ?
Date: Sat, 19 Dec 2009 01:36:41 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20091216 Shredder/3.0.1pre

i've got a strange audio overrun (aOaOaO) problem. My scheme is the following :

audio_source ---- > FFT_graphical sink

signal = audio.source(32000,'plughw:0,0', True)

fft = fftsink2.fft_sink_f(panel,title="Spettro Segnale Vocale",


it happens to get in random way these cases :

case 1 : i get it fully working with no errors in the terminal

case 2 : it works displaying the FFT with the terminal showing repeatedly the "aO" error

case 3 :  it shows the  blank display of the FFT with the terminal showing repeatedly the "aO" error

i  edited in my home the config.conf file in ~./gnuradio in this way to override the settings:


verbose = False

audio_module = audio_alsa

# specify which audio module to load, or use "auto" to have the system
# select one.  Valid choices depend on your OS and which modules
# you've installed, but typically include: auto, audio_alsa,
# audio_oss, audio_portaudio, audio_jack, audio_osx, audio_windows

default_input_device = plughw:0,0
default_output_device = plughw:0,0
period_time = 0.010                      # in seconds
nperiods = 4                                 # total buffering = period_time * nperiods
verbose = false

i'm using ubuntu 9.04 with the last unstable deb version dated 10.22.2009. If i enter the terminal and digit "asoundconf set-default-card SB" (SB is my first listed audio card) and reboot it seems to adjust by itself so i just decided to put it in the start commands of the OS. The strange thing is that my laptop is a dual-core laptop and i read that a fast computer could usually help to solve this overrun problem (my previous laptop was not a good one :D). Did i maybe need an update of the alsa drivers ? I hope you can help me....

         thx in advance, Arturo

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