Re: [ecasound] Using Ladspa surround encoder?

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Subject: Re: [ecasound] Using Ladspa surround encoder?
From: Eric Dantan Rzewnicki (eric_AT_zhevny.com)
Date: Fri May 28 2004 - 05:28:54 EEST

Greg Lee wrote:
> The following generates silence -- all data is the minimum
> possible value:
>
> ecasound -d -f:16,2,22050 \
> -a:1 -f:s32_le,1,22050 -i amb1.wav -ea:.1 \
> -a:2 -f:s32_le,1,22050 -i amb2.wav -ea:.1 \
> -a:3 -f:s32_le,1,22050 -i amb3.wav -ea:100 \
> -a:4 -f:s32_le,1,22050 -i amb4.wav -ea:.01 \
> -a:1,2,3,4 -f:s32_le,4,22050 -el:surroundEncoder, \
> -f:16,2,22050 -o temp.wav
>
> What am I doing wrong? I've tried various applifications and
> input file formats, but I always get the same bad result.
>
> Greg

I'm not familiar with the surroundEncoder plugin, but you may need to
check out -erc in man ecasound. with this you can route the channels
like so:

ecasound -d -f:16,2,22050 \
         -a:1 -f:s32_le,1,22050 -i amb1.wav -ea:.1 \
         -a:2 -f:s32_le,1,22050 -i amb2.wav -ea:.1 -erc:1,2 \
         -a:3 -f:s32_le,1,22050 -i amb3.wav -ea:100 -erc:1,3 \
         -a:4 -f:s32_le,1,22050 -i amb4.wav -ea:.01 -erc:1,4 \
         -a:1,2,3,4 -f:s32_le,4,22050 -el:surroundEncoder, \
         -f:16,2,22050 -o temp.wav

Something like that should help you, I think. I haven't tested it, but
that should at least get you close.

You may already know, but just to be sure, the -ea: parameter is a
percentage. So -ea:100 means no change to volume. < 100 decreases
volume, > 100 increases volume. Your -ea:.1 and -ea:.01 will be very
very quiet. Also, the mix routine in ecasound is such that when mixing n
channels I typically use -ea:(100*n) to keep the levels up after mixing.

Also, your first -f: specification is probably not needed since you
override it your next lines. each -f: affects all following inputs and
outputs until the next -f:. It's also not needed for .wav files because
the format information inside the .wav will override your commandline
-f:. If you want ecasound to use your files as some format other than
what their wav headers say they are, then you may need to use resample
objects like this: -i resample,22050,foo.wav, or whatever is appropriate
for you.

Hope this helps,
Eric Rz.

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