Does anybody on this list have a lot of experience identifying sources
of scheduling latency in the kernel? I've got an old laptop that I'm
trying to make realtime audio safe, and I've run into a wall. I'm
running Gentoo with 2.6.29.4-rt15, and no matter how large I make my
audio buffers, I still
On 5/23/07, Nigel Henry <[EMAIL PROTECTED]> wrote:
> An update:
>
> Jaime. He is running Kubuntu, and has tried to follow the instructions at.
> http://www.bxlug.be/articles/306
There is a complete HOWTO for the Tascam line here:
http://ubuntuforums.org/showthread.php?t=30891
The original HOWTO i
eturn -EPIPE" after that
error message, and now jackd doesn't crash. There are noticeable
audio clicks whenever one of these errors occurs, but the driver seems
to have no problem recovering, as audio continues.
Mike
On 4/26/07, Michael Bourgeous <[EMAIL PROTECTED]> wrote:
.
Hi,
I recently upgraded my system from 32-bit Ubuntu Edgy, with a custom
hard-realtime-enabled 2.6.19 kernel, to 64-bit Ubuntu Feisty, with a
hard-realtime-enabled 2.6.20 kernel. I also switched from an Athlon
XP 2600 to an Athlon 64 X2 4600. In every way my new system should be
faster, but jack
I would suggest sending this to Lexicon. I doubt they'd do anything
about it, but they might want to know. Lexicon has long been an
effects/audio processing company, so their first entry into the world
of USB may have been a learning experience for their engineers. They
may have used the same co
You may look for settings like "playback buffer" or "buffer size".
One option you might try is running jackd with a buffer size of 512 or
1024, and using an .asoundrc file in your home directory to create a
jackd PCM and set it as the default PCM.
Mike Bourgeous
On 4/8/07, Jason Heeris <[EMAIL PR
Try testing your program by reading a raw PCM file from disk, to see
if it is ffmpeg's encoding routines (which seems likely if the S16_LE
format is working). If you are able to record flawless raw audio with
your program, then you'd probably get better answers by asking on the
ffmpeg list.
Mike
Ingo's solution gets my vote. I AM a programmer, and I have written
kernel code, hotplug scripts, etc. Nobody is taking those away. The
default is simply being made more sensible. Writing a new script for
every sound card, or figuring out a nice regex to write one script for
multiple cards, is
-- Forwarded message --
From: Michael Bourgeous <[EMAIL PROTECTED]>
Date: Feb 28, 2007 1:30 AM
Subject: Re: [Alsa-user] Home Theatre PC to Decode Digital Input
To: "Dustin C. Hatch" <[EMAIL PROTECTED]>
You could probably do some research on how AC3-wavs and
Sorry, that should be 2.67ms. However, Windows only allows selection
down to 5.33ms. The realtime preemption patches are required to reach
that.
On 2/23/07, gtrfree <[EMAIL PROTECTED]> wrote:
> Michael Bourgeous gmail.com> writes:
>
> >
>
> Hi Michael, thank you for
My US-428 works great, but with the following caveats:
- After using jack with the 4-channel input, I have to power cycle the
device to use it with anything else.
- In order to get latency below 10-20ms without noise, I have to
change the priority of my IRQ handler with chrt. I can then get
1.67m
that requires a lower sample rate? (my intuition always tells
me I want a higher sample rate, unless I need to match a certain
standard (i.e. 44.1 for CDs)).
Mike
On 2/13/07, Vladimir Mosgalin <[EMAIL PROTECTED]> wrote:
> Hi Michael Bourgeous!
>
> To answer original post: my M
What's the application? Resampling from 8k to 48k wouldn't be good enough?
On 2/13/07, Tobias Söreling <[EMAIL PROTECTED]> wrote:
>
>
>
> Hi everyone, I have managed to get my USB soundcard to work fine with
> alsa-utils but unfortunately it is only possible to open it in 44100 and
> 48000 Hz.
>
Try looking for a setting called "IEC958 Optical Raw Playback" in
alsamixer or amixer, and disable it. That usually does the trick when
Dolby Digital/DTS passthrough works, but raw PCM doesn't.
Mike
On 2/11/07, Rick Warner <[EMAIL PROTECTED]> wrote:
> Hello all,
>
> I'm having trouble getting sp
The best place to put your stuff is in ~/.asoundrc. There are global
files, but they're wiped out with new releases of the alsa tools. If
you want all your system's users to have the same settings, put the
.asoundrc file in /etc/skel/ and it will be copied into all new users'
home directory. for
On 1/29/07, Matt Savigear <[EMAIL PROTECTED]> wrote:
> On Sun, 28 Jan 2007 19:09:44 -0700
> "Michael Bourgeous" <[EMAIL PROTECTED]> wrote:
> > I've been trying this for a while, but I've been unable to get
> > anything to record from inputs C an
I've been trying this for a while, but I've been unable to get
anything to record from inputs C and D on my Tascam US-428. Currently
I'm using the 1.14-rc alsa driver. I've finally managed to get down
to 5.33 ms latency using Ingo Molnar's realtime kernel patches and
setting the USB interrupt han
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