Subject: Re: [ecasound] Synchro saga: some background
From: S. Massy (theanaloguekid@tak.net.dhis.org)
Date: Mon Mar 19 2001 - 03:33:08 EET
On Sun, 18 Mar 2001, Roy Cutler wrote:
> On Sunday 18 March 2001 10:15, you wrote:
> > > ecasound -r -i:/dev/dsp0 -o drums.wav
> >
> > Why are you using OSS emulation? I find it rather quirky still in 0.9.0,
> > what if you try with ALSA native? Also, you might want to use -z:db here
> > too, not that I think it to be related to your problem but, oh well, you
> > usually want the db system on when dealing with non-rt objects.
>
> I tried it with -z:db with the same effect. I also used /dev/dsp with no
> change.
>
> > > To mix:
> > > ecasound -a:1 -i drums.wav -a:2 -i guitar1.wav -a:all -o /dev/dsp
> > > And now the guitar is some odd fraction of a beat behind the drums. This
> > > occurs both with ALSA and with OSS drivers. It occurs with every
> > > reasonable buffer size. I have tried buffer sizes for mixing as well,
> > > without apparent effect.
> >
> > How big is the delay actually? What if you mix down to file instead of the
> > soundcard?
> > If all else fails you could still go in interactive mode with a cs like
> > this: ecasound -a:1 -i:drums.wav -a:2 guitar1.wav -a:all -o:/dev/dsp -c
> > and fix the delay using aio-setpos.
>
> I am running by default in interactive mode. That's why it doesn't show up in
> the command.
> The delay is fractions of a second. From my reading of aio-setpos that may be
> too small an interval of time. Mixing to file produces the same effect. I
The argument you can give to aio-forward is a float so you can deal with
miliseconds if you're patient enough, though I admit this isn't the optimal
way to go as it implies a lot of fumbling around.
> think it is happening pre-mix for reasons I'll explain in my response to
> Teppo.
>
> > Keep us informed of your success/failures,
> > S. Massy
>
> Thanks for your forebearence.
> Roy
>
> --
> Roy Cutler
> rcutler@bigfoot.com
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