20 Jul
2013
20 Jul
'13
6:26 p.m.
Hi again Fons.
Fons Adriaensen <fons(a)linuxaudio.org> a écrit :
Oops. I use a generic 3.7 kernel that allow real-time, so -r is bad.
The correct switch is -R (default).
I confirm: when using Jack with the internal soundcard (with 2 output
channels), Mplayer limit its number of output channels to 2, even if I
specify the number of channels of my sound file (4) to Mplayer.
Update:
- I installed the latest Jackd (version 1.9.10 from Grame): zita-j2a now works! :)
after the "Starting synchronisation" message, there's now a
continuous sequence of numbers. Suggestion: a note in the
documentation about the version of Jackd would help.
- I installed the latest Mplayer (2): same behaviour...
Thanks for you help.
N.B. The descriptions in the man pages are inverted:
zita-j2a - Use ALSA capture device as a Jack client, with resampling.
zita-a2j - Use ALSA playback device as a Jack client, with resampling.
--
Marc
jackd -r -d
alsa -d hw:2 -P -o 8 -z shaped
Why do you use -r ? Does your system not allow real-time ? Why -o 8 ? Even if you have 8 outputs that is not
necessary.
Oops again; all channels are available without -o 8.
There is no need to resample anything.
Right... This is your use case for zita-resampler:
"The development of zita-resampler was triggered by the need to
resample multichannel files (HOA, 25-ish channels), while still keeping
some CPU capacity for other tasks."
So I don't need it. Less is more! :)
Does hw:1 work with Jack ?
Yes.
Did you connect anything to the zita-j2a ports ?
Yes.
As said, unless you have some voodoo SW on your
machine, that is not
possible. If mplayer uses jack, it doesn not know anything about the
sound card. Not the sample format, not the number of channels, only
the sample frequency.
So Mplayer is just reporting the output frequency of Jack?
Another
problem: when starting Jack with a 2 channels sound card,
Mplayer can't output more than 2 channels.
Again, mplayer can't know this. Your are probably running on
some other soundcard, not using Jack.