Re: channel manipulation

On Sun, September 30, 2012 3:26 am, Sean Vergauwen wrote:
> Helloooo list members and Patrick in particular,
>
> I've been having a lot of fun reading the chatter and trying to fix this
> problem.
>

Thanks Sean, I think you just cracked the case :-)

I'll run some tests and if it is working I'll release the full script as a
stereo to surround sound convertor...



Cheers

Patrick


> On 09/28/2012 03:23 AM, Patrick Shirkey wrote:
>> Afaict the channels that take a loop input are not receiving any audio
>> at
>> all. Is it possible that the loop input is only wanting a live feed?
>>
>> I have tried the following:
>>
>> +++
>> Channel 5,6 are silent. Channels 1,2,3,4 have audio but I'm not sure yet
>> if they are correct. I want to fix channels 5,6 first.
>>
>> - Tested output with these two chains to make sure I'm not being stupid:
>>
>> ecasound -a:1 -i test-out.wav -o alsa
>> ecasound -a:1 -i test-out.wav -chmute:1 -chmute:2 -chmute:3 -chmute:4
>> -ea:1000 -chmix:1 -o alsa
>>
>> I can see a very small waveform on channel 5,6 in audacity but there is
>> no
>> sound coming from those channels at all.
>>
>> converter script:
>>
>> 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 -o loop,1 \
>> -a:7,8 -i loop,1 \
>> -a:7  -ea:200 -chmix:5 \
>> -a:8  -chmix:6 \
>> -a:all -o test-out.wav
> Here's the good bits:
>
> ##   you don't want -a:all -o test-out.wav    - you want chain 5 and 6
> to go to the loop device (remember?)
> ##   you're working on 6 channel chains where you actually want to work
> on 2 channels and do the _mixdown_ to 6 channels
>
> ecasound -t 5 -f:s16_be,2,48000 \
> -a:1,2,3,4,5,6 -i TEST_1-2.aif \
> -a:1 -chmute:2 \
> -a:2 -chmute:1 \
> -a:3 -chmix:3 -eac:400,3 \
> -a:4 -chmix:4 -eac:400,4 \
> -a:5 -chmute:1 \
> -a:6 -chmute:2 \
> -a:5,6 -o loop,1 \
> -a:7,8 -i loop,1 \
> -a:7 -chmix:5 -eac:800,5 \
> -a:8 -chmix:6 -eac:800,6 \
> -a:1,2,3,4,7,8 -f:s16_be,6,48000 -o test-out.wav
>
> I haven't figured out -chmix's behavior, but the -eac's are there to
> counter it's lowering of the volume in this particular set-up.
> This probably has its own bugs, is most likely not what you want and
> looks more like a hack than a chain setup.
> Nonetheless, this seems to have some audio on channels 5 and 6, which
> you weren't getting before.
>
> Hope this helps,
>
> Cheers,
>
> me
>
>
>
>
>
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--
Patrick Shirkey
Boost Hardware Ltd

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