On 2011/05/09 11:08, Marc Lavallée <m...@hacklava.net> wrote:
> If it is already possible, how to play a 4 channels wav file through a
> jack connection? Is there something to configure on the MPD side? When I
> tried, MPD was creating a 2 channels connection at play time, not a
> 4 channels connection.

Configure the desired number of JACK "source_ports" in mpd.conf.  By
default, there are two.

> Also: how to make a permanent jack connection?
> When pausing or stopping playback, the MPD jack client disappear.

That is because the JACK protocol forces all clients to generate PCM
samples, even if they do not want to play currently.  There is no way
to pause a JACK connection.  Idle clients must generate "silence"
samples all the time.  That JACK design flaw needlessly wastes a lot
of CPU cycles, and on laptops, it wastes battery power.  MPD does not
do that by default.

You can use the option "always_on" to force MPD to do it.

Max

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