Re: [ecasound] channel manipulation

On Sat, September 29, 2012 6:19 am, S. Massy wrote:
> 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.
>

The test track is 5 seconds of one person talking.

Do you mean cancellation in the playback or cancellation in the chain signal?

--
Patrick Shirkey
Boost Hardware Ltd
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