[LAU] Console based software EQ for jack

[Stefan Stefanov]

Hi Julien

In process of accomplish my task with EQ I discover a problem playing
music with ecasound.

If I execute: ecasound -i test.wav -o
jack_multi,system:playback_1,system:playback_2
then I get this error:
"ERROR:  Connecting chainsetup failed: "All audio objects must have a common
... sampling rate; sampling rate of audio object "jack_multi" differs from
... engine rate (48000 <-> 44100); unable to continue."
"
I run jack like this: /usr/bin/jackd -P 85 -d alsa -P hw:2,0 -n 3 -p 256

(test.wav format is 16,2,44100)

Regards
Stefan


2013/1/17 Julien Claassen <julien at mail.upb.de>:
> Hello Stefan!
>   Ecasound's basic concept is chains. A chain looks like this:
> input -> possible processing options -> output
>   So you can use jack intput and output:
> ecasound -f:16,2,44100 -i jack_multi,mpd:out1,mpd:out2 -o \
> jack_multi,system:playback_1,system:playback_2
>   At the end of this line you can add effects. For example a filter. You can
> use LADSPA unique IDs or the labels. I prefer IDs, since I always forget
> upper and lower case letters. So the GLAME Highpass IIR filter (label:
> highpass_iir and ID 1890). It has two parameter cutoff and poles/stages. You
> can find that out with analyseplugin from the basic ladspa suite or look it
> up in your favourite graphic ladspa host. So at the end of the ecasound line
> we have:
> -eli:1890,50,2
> or
> -el:highpass_iir,50,2
>   Adds a highpass filter with 50Hz cutoff frequency and two stages/poles.
>   My favourite EQ is still Fons Adriaenson's 4-band parametric EQ (1970). I
> think the package is called 4-band parametric filter (or just filter). It
> has a lot of options, you can try them in your favourite graphical
> application first and then copy all the values, that you found. probably
> easiest for you.
>   If you need more help ask. - one last note: the -f:16,2,44100 is the
> ecasound audio formation option, see the manpage. It's
> bitrate,number-of-channels,samplerate. So this is CD-quality. Adapt to your
> needs.
>   Warmly yours
>        Julien
>
> ----------------------------------------
> http://juliencoder.de/nama/music.html