[ecasound] Fwd: audio dropouts whith ECI

On Mon, Sep 1, 2008 at 10:21 PM, Kai Vehmanen <kvehmanen@email-addr-hidden> wrote:
> Hi,
>
> On Fri, 29 Aug 2008, Oliver Oli wrote:
>
>> Last thing that bugs me: I'm using ecasound from Python that receives
>> OSC messages and translates them to c-select and cop-set commands for
>> ecasound. For testing I sent an OSC message every 10ms, which led to
>> dropouts every few seconds.
>> Jack (on Linux) displays no xruns at all
>> and CPU load is reasonably low.
>
> hmm, if Jack doesn't report xruns, how do you verify that there were
> dropouts .. is there a gap in the audio stream produced by ecasound for
> other JACK clients?

I haven't recorderd the audio stream with some other jack client. It's
producing just audible gaps, which doesn't sound like an xrun sounds
normally.

> Oh, and is JACK running with real-time priority? If it's not, then there's
> nothing protecting the real-time sensitive parts of JACK (and its clients)
> from other application thread/processes...

It's running with rt priority on multimedia kernel (64studio). jack
seems to run rock stable on this system.

>> Seems to me that the problem lies
>> somewhere in ecasound. Or can my Python script somehow block ecasound?
>> I can also reproduce this on OS X and with the Ruby eci lib.
>
> A lot of effort has been gone to isolate the control parts (whatever an ECI
> client or a (G)UI built on top of libecasound does) from the engine. So when
> the engine is run with real-time priority, nothing in other parts of the
> system should be able to interfere with it. The protection is enforced by
> the kernel, so it is fairly robust.
>
> But, but, if you have a glitch, then something is definitely not right.

maybe it hasn't anything to do with ECI or RT. I'll have to make
further tests later. Maybe some problems with the LADSPA plugins I've
used.

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Received on Wed Sep 3 16:15:01 2008