Re: channel manipulation

On Sat, Sep 29, 2012 at 05:41:14AM +1000, Patrick Shirkey wrote:
> 
> On Sat, September 29, 2012 2:05 am, S. Massy wrote:
> > On Fri, Sep 28, 2012 at 11:23:09AM +1000, Patrick Shirkey wrote:
> >> ecasound -t 5 -f:s16_be,6,48000 \
> >> -a:1,2,3,4,5,6 -i TEST_1-2.aif \
> >> -a:1 -chmute:2 \
> >> -a:2 -chmute:1 \
> >> -a:3 -chmix:3  \
> >> -a:4 -chmix:4  \
> >> -a:5 -chmute:1  \
> >> -a:6 -chmute:2 \
> >> -a:5,6 -chmix:5 -chcopy:5,6 \
> >> -a:all -o test-out.wav
> >>
> >> +++
> > I've only skimmed this thread as it unfolded, but I must say I'm a bit
> > puzzled as to what exactly you are trying to achieve: could you explain?
> > Why do you keep mixing the signal with itself?
> >
> 
> I have stripped each chain of it's respective filters to make sure that
> the actual chain is correct and avoid any further confusion.
> 
> > All this channel manipulation can obfuscate things somewhat; perhaps a
> > simple way to debug could be to employ a two step method where you send
> > each channel to a single wave file and then rejoin them in a 6-channel
> > file again. Once you get the expected result, you could just modify your
> > setup to do it in one go.
> >
> 
> I've already done that. My objective is a complete chain setup and I would
Successfully, I take it?

> like to know why the code I have is not working. As far as I can tell it
> should result in valid output on channels 5,6. It doesn't make any sense
> that the output on those channels is silent.
It's a long shot, but are you aware that loop devices introduce a delay
of one buffersize (so about 21.3 MS for -b:1024)? If you have anything
like a periodic signal, this could conceivably cause some cancellation.

Cheers,
S.M.

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