Re: [LAD] ALSA MIDI latency test results are far away from reality

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To: Robin Gareus <robin@...>
Cc: 64studio-devel <64studio-devel@...>, Linux-Audio-Dev <linux-audio-dev@...>
Date: Wednesday, July 14, 2010 - 5:58 pm

On Wed, 2010-07-14 at 17:30 +0200, Robin Gareus wrote:

Yes there are lapse, even if there should be no messages about xruns.

> I was hinting that the audible midi-jitter could be a result of

It seems to be like that. Take a look at my email with the
subject:
Correlation of alsa -p value and hw
MIDI jitter

> A JACK-MIDI app which does not honor 'jack_midi_event_t->time' but

I did use Qtractor, but had the same issue when using Rosegarden a long
time ago. But we are talking about ALSA MIDI to the hardware
MIDInterface?!

> > IIRC when I did tests for the USB MIDI with -p64 or even -p125 (I'm not

All kinds of dropouts, even the left and right channel seem to get out
of phase. Just running FluidSynth DSSI playing a kick and a rim-shot was
without audible failure at -p16, but I'm sure I won't be able to do
multi-trach recording with -p16.

>

On a todo list, but there seems to be a correlation to JACK audio.

>

C64 and Atari ST are stable, but there are some issues for e.g the
monitor. My VGA isn't slow enough for the Atari. I'll try to do it with
the broken SM124.

> 'aseqdump' (at least version 1.0.22 which I currently use) does not

Thank you for your effort :).

>

Have a nice weekend too.
I'll spend the weekend for Linux audio.

>

Cheers!

Ralf

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Messages in current thread:
Re: [LAD] Tests directly routing pc's midi-in to midi-out, Clemens Ladisch, (Thu Jul 15, 6:26 am)
Re: [LAD] Tests directly routing pc's midi-in to midi-out, Arnout Engelen, (Thu Jul 15, 9:48 am)
Re: [LAD] Tests directly routing pc's midi-in to midi-out, Ralf Mardorf, (Thu Jul 15, 10:18 am)
Re: [LAD] Tests directly routing pc's midi-in to midi-out, Clemens Ladisch, (Thu Jul 15, 10:55 am)
Re: [LAD] Tests directly routing pc's midi-in to midi-out, Ralf Mardorf, (Thu Jul 15, 11:08 am)
Re: [LAD] Tests directly routing pc's midi-in to midi-out, Robin Gareus, (Thu Jul 15, 11:45 am)
Re: [LAD] Tests directly routing pc's midi-in to midi-out, Clemens Ladisch, (Thu Jul 15, 2:31 pm)
Re: [LAD] Tests directly routing pc's midi-in to midi-out, Ralf Mardorf, (Thu Jul 15, 12:45 pm)
Re: [LAD] Tests directly routing pc's midi-in to midi-out, Ralf Mardorf, (Thu Jul 15, 10:49 am)
Re: [LAD] Tests directly routing pc's midi-in to midi-out, Robin Gareus, (Fri Jul 16, 11:26 am)
Re: [LAD] Tests directly routing pc's midi-in to midi-out, Ralf Mardorf, (Fri Jul 16, 11:30 am)
Re: [LAD] ALSA MIDI latency test results are far away from r..., Ralf Mardorf, (Wed Jul 14, 5:58 pm)