Re: Simultaneous recording with arecord - xrun problems

[Douglas.Arellanes@xxxxxxxx]

Hi Clemens,

Thank you for your pointer. I checked syslog and indeed there were numerous error messages there which read:

Nov 24 17:00:31 douglas kernel: [21278.820736] cannot submit datapipe for urb 0, error -28: not enough bandwidth

I tried to connect the sound cards into a fast computer directly, and starting multiple instances of arecord worked without errors. Then I plugged the sound cards directly into the embedded computer that I'll be using for my project, and that also worked without errors.

I'm using a D-Link DUB-H7 USB 2.0 hub. I'd have never thought the hub was the culprit. Would you happen to have any tips on how to increase the hub's throughput, or possibly to recommend a hub that would do the trick?

Regardless, thanks very much for your assistance on this list.

douglas

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-----Clemens Ladisch <clemens@xxxxxxxxxx> wrote: -----

To: Douglas.Arellanes@xxxxxxxx
From: Clemens Ladisch <clemens@xxxxxxxxxx>
Date: 11/24/2009 06:28PM
cc: alsa-user@xxxxxxxxxxxxxxxxxxxxx
Subject: Re: Simultaneous recording with arecord - xrun problems

Douglas.Arellanes@xxxxxxxx wrote:
> I have a project I'm working on monitor radio stations' news broadcasts. The
> problem is that most stations have their news broadcasts at the same time, e.g.
> at the top of the hour. So I need to record multiple radio stations simultaneously.
>
> I've got multiple USB sound cards (all of them are SoundBlaster X-Fi Go! cards).
>
> However, when I try to do run one instance of arecord on plughw:1,0 and then
> another instance of arecord on plughw:2,0, I get an error message on the second
> instance, specifically:
>
> arecord: xrun:1206 read/write error, state=PREPARED

Is there any error message in the system log?
Probably one that complains that there is not enough USB bandwidth?


Best regards,
Clemens

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