Re: [LAU] Introductory seq24 tutorial

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To: Leigh Dyer <lsd@...>
Cc: <linux-audio-user@...>
Date: Wednesday, October 27, 2010 - 10:33 am

Hi Leigh,
you wrote:

>> - What toolchain did you use? Was it the Xephyr/jack_capture/ffmpeg

I tinkered around with Xephyr for a while today, and had some problems
with what was described on http://www.rncbc.org/drupal/node/219#comment-3859 -
specificly, starting your X session with simply "/etc/X11/Xsession &" did
not work for me - the harddisk started rattling for a while, but nothing
happened. I'd think that it is trying to "start too much" of the services,
some of which are perhaps already running through my initial login.

What I instead did now was to:
- Enable XDMCP on my PC (via /etc/gdm/custom.conf)
-> for Ubuntu Karmic, see http://www.peppertop.com/blog/?p=690
- Start Xephyr like this:
Xephyr :2 -query 127.0.0.1 -once -screen 1280x1024
- Log in as usual, set up applications and continue from there
- Start jack_capture&ffmpeg from outside Xephyr as described by you below.

I also noticed that if I log in as some other user (one with a "default"
Ubuntu desktop, perhaps better for screencasts), I need to allow the "host"
to read the XDisplay of the "guest" by issuing a "xhost localhost" before
I can start ffmpeg.
However, this means that if I run QJackCtl/jackd as that other user, I cannot
get at its audio stream with any JACK client - not even as root. I assume
that is a safety mechanism in JACK. But there are ways to overcome this,
like with sudo.

> I used ffmpeg's default MPEG-4 compression, but with a very high maximum

Ah, ok - a "manual initial sync". As long as video is correctly recorded
thereafter (no framedrops?), this should be fine.

Thanks a lot for these explanations - this is all most useful to me.

Greetings,
Frank
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Messages in current thread:
[LAU] Introductory seq24 tutorial, Leigh Dyer, (Tue Oct 26, 1:53 am)
Re: [LAU] Introductory seq24 tutorial, rosea.grammostola, (Mon Nov 15, 2:06 pm)
Re: [LAU] Introductory seq24 tutorial, Leigh Dyer, (Fri Nov 5, 10:32 am)
Re: [LAU] Introductory seq24 tutorial, jy, (Fri Nov 5, 11:07 am)
Re: [LAU] Introductory seq24 tutorial, jy, (Sat Nov 6, 10:46 am)
Re: [LAU] Introductory seq24 tutorial, Leigh Dyer, (Sat Nov 6, 2:08 pm)
Re: [LAU] Introductory seq24 tutorial, jy, (Sat Nov 6, 4:51 pm)
Re: [LAU] Introductory seq24 tutorial, Frank Neumann, (Tue Oct 26, 11:11 pm)
Re: [LAU] Introductory seq24 tutorial, Jeremy Jongepier, (Wed Oct 27, 9:40 am)
Re: [LAU] Introductory seq24 tutorial, Leigh Dyer, (Wed Oct 27, 12:08 am)
Re: [LAU] Introductory seq24 tutorial, , (Thu Oct 28, 12:36 am)
Re: [LAU] Introductory seq24 tutorial, Frank Neumann, (Wed Oct 27, 10:33 am)
Re: [LAU] Introductory seq24 tutorial, Jeremy Jongepier, (Tue Oct 26, 2:54 pm)
Re: [LAU] Introductory seq24 tutorial, Louigi Verona, (Tue Oct 26, 2:57 pm)
Re: [LAU] Introductory seq24 tutorial, Leigh Dyer, (Tue Oct 26, 9:47 pm)
Re: [LAU] Introductory seq24 tutorial, Louigi Verona, (Wed Oct 27, 10:55 am)
Re: [LAU] Introductory seq24 tutorial, Leigh Dyer, (Wed Oct 27, 11:49 am)
Re: [LAU] Introductory seq24 tutorial, Jeremy Jongepier, (Wed Oct 27, 8:09 am)
Re: [LAU] Introductory seq24 tutorial, Esben Stien, (Tue Oct 26, 10:13 pm)
Re: [LAU] Introductory seq24 tutorial, Daniel Worth, (Tue Oct 26, 1:11 pm)
Re: [LAU] Introductory seq24 tutorial, Dave Phillips, (Tue Oct 26, 1:28 pm)
Re: [LAU] Introductory seq24 tutorial, jy, (Tue Oct 26, 1:29 pm)
Re: [LAU] Introductory seq24 tutorial, Louigi Verona, (Tue Oct 26, 2:06 pm)
Re: [LAU] Introductory seq24 tutorial, diego simak, (Tue Oct 26, 2:14 pm)
Re: [LAU] Introductory seq24 tutorial, Louigi Verona, (Tue Oct 26, 2:23 pm)
Re: [LAU] Introductory seq24 tutorial, Bengt , (Tue Oct 26, 2:50 pm)
Re: [LAU] Introductory seq24 tutorial, diego simak, (Tue Oct 26, 2:28 pm)
Re: [LAU] Introductory seq24 tutorial, Charles Fleche, (Tue Oct 26, 2:51 pm)
Re: [LAU] Introductory seq24 tutorial, Charles Fleche, (Tue Oct 26, 2:49 pm)
Re: [LAU] Introductory seq24 tutorial, rosea.grammostola, (Tue Oct 26, 1:17 pm)
Re: [LAU] Introductory seq24 tutorial, rosea.grammostola, (Tue Oct 26, 1:15 pm)