Re: [ecasound] q about chaining ladspa effects

Hi!

Went well, thank You. For those, who are curious, here is the project i
used ecasound for: https://github.com/markmerz/ladspa-sq-sv
Its a decoder program for surround sound vinyl records of the seventies.

On Tue, Apr 26, 2016 at 12:49 AM, rtaylor <rtaylor@email-addr-hidden> wrote:

> Hi Markko,
>
> Both your scenarios are possible with ecasound.
>
> For you #1, probably the best way is to process one channel at a time (in
> separate chains) and take care of channel mapping yourself:
>
> ecasound -x -z:mixmode,sum -a:all -f:,2 -i:in.wav -f:,4 -o:out.wav \
> -a:L -chorder:1,0 -el:hilbert -chorder:1,2,0,0 \
> -a:R -chorder:2,0 -el:hilbert -chorder:0,0,1,2
>
> What this does:
>
> - input is in.wav (2 channels)
> - output is out.wav (4 channels)
> - chain "L" applies a Hilbert transform to ch 1 only, with output to ch
> 1&2 and silence on ch 3&4 (the two -chorder commands here actually aren't
> needed; I put them in for clarity)
> - chain "R" moves ch. 2 to ch. 1 (where the hilbert plugin expects its
> input), applies a Hilbert transform, then maps outputs from ch 1&2 to ch
> 3&4, with silence on ch 1&2
> - the final 4-ch signal is assembled when outputs of "L" and "R" chains
> are summed at the output
>
> Without the "-z:mixmode,sum" ecasound will *average* the chains' outputs
> instead of summing, and your output will be down 6dB.
>
> Your #2 is actually simpler, and should be do-able with a single chain:
>
> ecasound -x -f:,2 -i:in.wav -f:,4 o:out.wav -el:my2to4 -el:my4to4
>
> Haven't tested this though, since I don't know any 2-to-4 or 4-to-4
> plugins. Let me know how it goes!
>
> Cheers,
> Richard
>
>
>
> On 2016-04-22 01:33 PM, Markko Merzin wrote:
>
> Double sorry. Troll is hungry tonight, it seems. Evolution mail client
> just deletes parts of my gmail messages. Third try, this time from gmail
> web interface.
>
> I'm new ...
> Been trying couple of evenings...
>
> Is it possible to deploy ecasound in following scenarios and how?
>
> On Fri, Apr 22, 2016 at 11:23 PM, Markko Merzin <
> <markko.merzin@email-addr-hiddenmarkko.merzin@email-addr-hidden> wrote:
>
>> Sorry, internet troll ate intro from my letter (or was it late time?)
>>
>> I'm new to ecasound and im having trouble with ladspa channel routing.
>> >
>> > 1. Input from stereo wav. Each channel is routed through lapdspa
>> > plugin
>> > which has one input and two outputs (swh's hilbert turn). Output is
>> > written to 4-channel wav.
>> >
>> > 2. Input from stereo wav, through ladpsa plugin with two inputs and
>> > four outputs and then through another plugin with 4 inputs and 4
>> > outputs.
>> >
>> > Regards,
>> > Markko
>> >
>>
>
>
>
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Received on Thu May 5 04:15:02 2016