Re: [LAU] Zita-ajbridge ?

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To: <linux-audio-user@...>
Date: Saturday, July 20, 2013 - 5:52 pm

On Sat, Jul 20, 2013 at 12:26:33PM -0400, Marc Lavallée wrote:

> > There is no need to resample anything.

I mean: there is no need to resample if you want to use mplayer with Jack.
If the audio file's sample rate doesn't match that of Jack, mplayer will
do the resampling.

> So Mplayer is just reporting the output frequency of Jack?

Both actually:

==========================================================================
Opening audio decoder: [pcm] Uncompressed PCM audio decoder
AUDIO: 44100 Hz, 2 ch, s16le, 1411.2 kbit/100.00% (ratio: 176400->176400)
Selected audio codec: [pcm] afm: pcm (Uncompressed PCM)
==========================================================================
AO: [jack] 48000Hz 2ch floatle (4 bytes per sample)

> > > Another problem: when starting Jack with a 2 channels sound card,

Because it wants to connect to four system:playback ports, and that fails.
And when the connection fails, mplayer deletes the output port. Which is
insane, but that's how it is.

Start Jack with two playback channels, and any program having at least
four jack inputs, e.g. ambdec. Then try

mplayer -ao jack:port=ambdec -channels 4 YOUR_4_CH_FILE

and mplayer will have four output ports and connect them to ambdec's
inputs, even if your sound card has only two outputs.

The real problem is that mplayer doesn't allow you to specify the
connections, they could be in any order. So chances are 1 in 24 that
they will be correct in this case. Mplayer is one of the many apps that
claim Jack support but get it all wrong.

> - I installed the latest Jackd (version 1.9.10 from Grame): zita-j2a now works! :)

What was your previous Jack version ?

> after the "Starting synchronisation" message, there's now a

Probably because you still use -v. See the README for what they mean.

> Suggestion: a note in the documentation about the version of

It shouldn't matter, unless it's *very* old. Zita-ajbridge requires
nothing special from Jack, apart from a working DLL. And that was
added at least five years ago.

Ciao,

--
FA

A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)

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Messages in current thread:
Re: [LAU] Zita-ajbridge ?, Marc , (Sat Jul 20, 2:33 am)
Re: [LAU] Zita-ajbridge ?, Fons Adriaensen, (Sat Jul 20, 11:47 am)
Re: [LAU] Zita-ajbridge ?, Marc , (Sat Jul 20, 1:36 pm)
Re: [LAU] Zita-ajbridge ?, Fons Adriaensen, (Sat Jul 20, 2:23 pm)
Re: [LAU] Zita-ajbridge ?, Marc , (Sat Jul 20, 2:08 pm)
Re: [LAU] Zita-ajbridge ?, Fons Adriaensen, (Sat Jul 20, 2:19 pm)
Re: [LAU] Zita-ajbridge ?, Marc , (Sat Jul 20, 4:26 pm)
Re: [LAU] Zita-ajbridge ?, Fons Adriaensen, (Sat Jul 20, 5:52 pm)
Re: [LAU] Zita-ajbridge ?, Marc , (Sun Jul 21, 12:50 am)
Re: [LAU] Zita-ajbridge ?, Fons Adriaensen, (Sun Jul 21, 11:41 am)
Re: [LAU] Zita-ajbridge ?, Marc , (Sun Jul 21, 1:14 pm)
Re: [LAU] Zita-ajbridge ?, Ralf Mardorf, (Sun Jul 21, 1:44 pm)