[Clam-devel] Ladspa+Clam problem

Pau Arumí pau.arumi at barcelonamedia.org
Mon Oct 12 05:33:44 PDT 2009

El dl 12 de 10 de 2009 a les 12:20 +0200, en/na Eugenio Rustico va
>  Hi,
> I'm using Clam for a very simple purpose: playing a wav file and
> passing it through an equalizer (3 bands is enough). I'm doing this on
> Ubuntu Studio 8.04 in C++ with Jack backend.
>  I'm using a multichannel file reader, a djeq (ladspa) and two
> audiosinks. The problem: audio is clean and real-time if I don't use
> ladspas; otherwise, sound is scattered and quite bad. Where shall I
> start debugging?
>  On my laptop everything is fine. However, when I test a network with
> the networkeditor on the pc where i need it (a powerful one...
> quad-core, 4G ram, two nvidia gtx 280, 2 sata hds 7200 and 10.000
> rpms, etc.) ladspa plugins make the sound awful and unusable.
> Unfortunately I can work on that machine in a limited amount of hours,
> it's not at home with me.
>  Jackd is launched through qjackctl, it's in realtime, and with 128
> frames/period and 3 periods/buffers i got no xruns at all (i know,
> they're not that good but sound is onboard and irq is shared with sata
> controller).

Hi Eugenio,
my guess is that clam's jack backend is not working with 128
frames/period (and should be fixed). Can you confirm this by trying
jackd at 512?


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