Subject: Re: [ecasound] -erc effect causes delay
From: Jeremy Hall (jhall_AT_maoz.com)
Date: Fri May 30 2003 - 05:43:34 EEST
yes, that solved it. thanks.
_J
In the new year, Kai Vehmanen wrote:
> On Thu, 29 May 2003, Jeremy Hall wrote:
>
> > ecasound -f:f32_le,1,48000 -i Track_3-1.wav -erc:1,2 -f:s32_le,2,48000 -o
> > alsa,out -a:jhall -i null -o null
> [...]
> > it didn't matter whether -o was null or rtnull it still got XRUNs.
>
> Xruns from ALSA? What kind of messages? Nuoll objects really can't produce
> xruns, but of course they might slow down processing and cause increased
> xrun risk for ALSA objects...
>
> > It should be pointed out the delay was not a simple delay, rather it was a
> > sample-synched copy on both channels, followed by delays that back off in
> > the right channel. It made for a nice phasing effect at small buffer
> > sizes.
> [...]
> > You might be able to reproduce by splitting a file into separate files,
> > one for each channel, then trying to rtcombine them with the example I
>
> Ok, this turned out to be a real bug, and a very nasty one (audio is
> leaked from mixdown round n-1 to unused source channels in mixdown round
> n). This explains why the result varies depending on buffersize setting.
>
> I've just put the fix to CVS. Can you verify it solves the problem?
>
> In any case, as this is a bug in the core audio mixing engine, we are
> talking about a serious bug. I'll probably have to release 2.3.0 because
> of this, and hopefully soon.
>
> Jeremy, thanks once again for the bug report!
>
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