Author Archives: fgomes

Openmeetings 1.6 RC1 VMWare appliance (using Ubuntu Server 10.04 LTS)

I’ve made a new VMWare image running Openmeetings, V1.6 RC1, available�here(the previous one is still available�here). There is also a�how-to�that I made during the VMWare image creation, if you are interested.�

The operating system is Ubuntu 10.04 LTS Server Edition, the login credentials are administrator / password. The same username and password was used for the Openmeetings login. MySQL root password is password. Openmeetings database user credentials are openmeetings / password. All functions are configured, including OpenOffice server for document conversion.

When starting the VM, VMWare will ask if the VM was moved or copied. I suggest to choose ‘moved’, if you choose ‘copied’, VMWare will create a new MAC Address for the network interface and the VM will start with no network interface (it has to be manually reconfigured to match the new MAC Address)

The VM is using DHCP (you will have to execute ifconfig to know its IP address and have a DHCP server running in your network). If you need to configure a fixed IP address you have to manually reconfigure the network interface.

After having the image running, use the following URL to access it: http://[ip address]:5080/openmeetings

Login using the credentials administrator / password

Choose the tab “Administration” and then “Configuration”. Now configure at least the SMTP server, port, system email address, email username and email userpass to enable the email notifications.�

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How to install Openmeetings 1.6 rc1 on Ubuntu Server 10.04 LTS

This how-to is based on�this�how-to written in�Spanish�for the 1.5 rc1 openmeetings version.

First we need to add the partner repositories, editing the sources.list file and removing the comments for the partner lines

sudo nano /etc/apt/sources.list

sudo apt-get update

Then install the necessary packages

sudo apt-get install -y java-package sun-java6-bin sun-java6-jdk sun-java6-jre mysql-server openoffice.org-writer openoffice.org-calc

sudo apt-get install -y openoffice.org-impress openoffice.org-draw openoffice.org-math imagemagick gs-gpl libart-2.0-2 libt1-5 zip unzip bzip2 subversion git-core checkinstall

sudo apt-get install -y yasm texi2html libfaac-dev libfaad-dev libmp3lame-dev libsdl1.2-dev libx11-dev libxfixes-dev libxvidcore-dev zlib1g-dev libogg-dev sox libvorbis0a libvorbis-dev libgsm1 libgsm1-dev libfaad2 flvtool2 lame swftools

Now, for the ffmpeg, it is necessary to download, compile and install it:

wget http://www.ffmpeg.org/releases/ffmpeg-0.6.1.tar.gz

tar -zxvf ffmpeg-0.6.1.tar.gz

cd ffmpeg-0.6.1/

./configure –enable-libmp3lame –enable-libxvid –enable-libvorbis –enable-libgsm –enable-libfaad –enable-libfaac –enable-gpl –enable-nonfree

make

sudo checkinstall

Now that all the dependencies for Openmeetings are met, let�s start the Openmeetings installation.

Get openmeetings (this includes the Red5 server):

wget http://openmeetings.googlecode.com/files/openmeetings_1_6_rc1_r3621.zip

Extract it and move it to /opt

unzip openmeetings_1_6_rc1_r3621.zip

sudo mv red5 /opt/

Change owner to nobody

sudo chown -R nobody: /opt/red5

Make all the scrips executable

sudo chmod +x /opt/red5/*.sh

sudo chmod +x /opt/red5/webapps/openmeetings/jod/*.sh

Now let�s create the startup script for openmeetings:

sudo nano /etc/init.d/red5

Paste the following code:

#! /bin/sh

#

# red5 red5 initscript

#

# Author: Simon Eisenmann .

#

set -e

PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

DESC=”Red5 flash streaming server”

NAME=red5

RED5_HOME=/opt/red5

DAEMON=$RED5_HOME/$NAME.sh

PIDFILE=/var/run/$NAME.pid

SCRIPTNAME=/etc/init.d/$NAME

# Gracefully exit if the package has been removed.

test -x $DAEMON || exit 0

# Read config file if it is present.

if [ -r /etc/default/$NAME ]

then

����������� . /etc/default/$NAME

fi

#

# Function that starts the daemon/service.

#

d_start() {

����������� start-stop-daemon –start -c nobody –pidfile $PIDFILE –chdir $RED5_HOME –background –make-pidfile –exec $DAEMON

}

#

# Function that stops the daemon/service.

#

d_stop() {

����������� start-stop-daemon –stop –quiet –pidfile $PIDFILE –name java

����������� rm -f $PIDFILE

}

case “$1″ in

����������� start)

���echo -n “Starting $DESC: $NAME”

���d_start

���echo “.”

����������� ;;

����������� stop)

���echo -n “Stopping $DESC: $NAME”

����������� d_stop

���echo “.”

����������� ;;


����������� restart|force-reload)

���echo -n “Restarting $DESC: $NAME”

���d_stop

���sleep 1

���d_start

���echo “.”

����������� ;;



ont>

����������� *)

���echo “Usage: $SCRIPTNAME {start|stop|restart|force-reload}” >&2

���exit 1

����������� ;;


esac

exit 0

exit 0

(above code available�here)

Now the same thing for openoffice startup script:

sudo nano /etc/init.d/openoffice

Paste the following code:

#!/bin/bash


# openoffice.org headless server script


#

# chkconfig: 2345 80 30


# description: headless openoffice server script

# processname: openoffice

#

# Author: Vic Vijayakumar

# Modified by Federico Ch. Tomasczik

#

OOo_HOME=/usr/bin

SOFFICE_PATH=$OOo_HOME/soffice

PIDFILE=/var/run/openoffice-server.pid

set -e

����������� case “$1″ in

����������� start)

����������� if [ -f $PIDFILE ]; then

����������� echo “OpenOffice headless server has already started.”

����������� sleep 5

����������� exit

����������� fi

����������� echo “Starting OpenOffice headless server”

����������� $SOFFICE_PATH -headless -nologo -nofirststartwizard -accept=”socket,host=127.0.0.1,port=8100;urp” & > /dev/null 2>&1

����������� touch $PIDFILE

����������� ;;

����������� stop)

����������� if [ -f $PIDFILE ]; then

����������� echo “Stopping OpenOffice headless server.”

����������� killall -9 soffice && killall -9 soffice.bin

����������� rm -f $PIDFILE

����������� exit

����������� fi

����������� echo “Openoffice headless server is not running.”

����������� exit

����������� ;;

����������� *)

����������� echo “Usage: $0 {start|stop}”

����������� exit 1

esac

exit 0

(above code available�here)�

Make both scripts executable:

sudo chmod +x /etc/init.d/red5

sudo chmod +x /etc/init.d/openoffice

Now let�s make both services start automatically:

sudo update-rc.d red5 defaults

sudo update-rc.d openoffice defaults

Almost done, now to create openmeetings database (we have created a database user named openmeetings with the password password):

echo “CREATE USER openmeetings@localhost;” | mysql -u root -p

echo “CREATE DATABASE openmeetings DEFAULT CHARACTER SET ‘utf8′;” | mysql -u root -p

echo “GRANT ALL PRIVILEGES ON openmeetings.* TO ‘openmeetings’@'localhost’ IDENTIFIED BY ‘password’ WITH GRANT OPTION;” | mysql -u root -p

echo “FLUSH PRIVILEGES;” | mysql -u root -p

And now configure openmeetings to use the database user created above:

sudo nano /opt/red5/webapps/openmeetings/conf/hibernate.cfg.xml

In the User / Password section, configure the correct database username (openmeetings) and password (password)�

Now start openmeetings and openoffice:

sudo /etc/init.d/red5 start

sudo /etc/init.d/openoffice start

Go to a browser and point to the following link:

http://[server ip]:5080/openmeetings/install

Press �Continue with step 1�

Then, fill the following fields:

Username

Userpass

Email

User time zone

Name

Default language

Then, finally click on the �Install� button, and that�s it!�

Please post your comments and�suggestions�

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Install low latency kernel on Ubuntu (Studio) 10.10 (Maverick)

After upgrading my Ubuntu from 10.04 to 10.10 I’ve noticed that there was no realtime or low latency kernel for it�Cry

The standard kernel behaves very well (for a standard kernel at least) with audio applications, at least up to what I tested – hydrogen, rackarrack (even with heavy processing effects) and 2 instances of ZynAddSubFx. �But I want to test Maverick with audio applications at least with a Low Latency kernel, so I used google, and found some references for how to do it.�Unfortunately�they link to unavailable kernel versions. I’ve also asked in Ubuntu Studio mailing list and�Mike Holstein said that he used the process described in the following link:

http://jackschnippes.freeunix.net/index.php/2010/11/04/lowlatency-kernel-and-realtime-kernel-for-ubuntu-10-10-maverick

This was one of the links I have found googling, and has the problem of broken link (the kernels referenced are not available anymore). So to make the story short, I’ve searched for newer kernel packages and headers (these are for Natty (11.04) but work on Maverick), and this is what I have done to have a low latency kernel installed in my Ubuntu Maverick (10.10) home studio PC (AMD64):

First, download the packages (headers from a Ubuntu Natty mirror, kernels from Alessio PPA):�

wget�http://mirror.pnl.gov/ubuntu//pool/main/l/linux/linux-headers-2.6.37-12_2.6.37-12.26_all.deb

wget�http://ppa.launchpad.net/abogani/ppa/ubuntu/pool/main/l/linux-lowlatency/linux-headers-2.6.37-12-lowlatency_2.6.37-12.26~ppa3_amd64.deb

wget�http://ppa.launchpad.net/abogani/ppa/ubuntu/pool/main/l/linux-lowlatency/linux-image-2.6.37-12-lowlatency_2.6.37-12.26~ppa3_amd64.deb

Then, install the packages:

sudo dpkg -i�linux-headers-2.6.37-12_2.6.37-12.26_all.deb

sudo dpkg -i�linux-headers-2.6.37-12-lowlatency_2.6.37-12.26~ppa3_amd64.deb

sudo dpkg -i�linux-image-2.6.37-12-lowlatency_2.6.37-12.26~ppa3_amd64.deb

And Voil�, a working low latency kernel on Maverick�Tongue out

For i386 architectures (didn’t test it), you can use the following packages instead:

PAE (more than 4GB RAM):

http://ppa.launchpad.net/abogani/ppa/ubuntu/pool/main/l/linux-lowlatency/linux-headers-2.6.37-12-lowlatency-pae_2.6.37-12.26~ppa3_i386.deb

http://ppa.launchpad.net/abogani/ppa/ubuntu/pool/main/l/linux-lowlatency/linux-image-2.6.37-12-lowlatency-pae_2.6.37-12.26~ppa3_i386.deb

Non PAE:

http://ppa.launchpad.net/abogani/ppa/ubuntu/pool/main/l/linux-lowlatency/linux-headers-2.6.37-12-lowlatency_2.6.37-12.26~ppa3_i386.deb

http://ppa.launchpad.net/abogani/ppa/ubuntu/pool/main/l/linux-lowlatency/linux-image-2.6.37-12-lowlatency_2.6.37-12.26~ppa3_i386.deb�

Now it is time to test this new kernel, but this will be another article. Please post any comment or correction, as I said I didn’t test the i386 platform, so you could post your results. I want to thank to Mike for its help in the Ubuntu Studio mailing list (and all the other users from Ubuntu Studio mailinglist that gave me suggestions about this) and Alessio for its�excellent�work with the low latency and realtime kernels.
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How to flash the BIOS without a floppy, using the CD-ROM

This is based on this how-to from Ubuntu forum, I’ve tested the CD-ROM method and it works flawlessly :-)

In summary, after being sure that a bios update is REALLY necessary, this is what I’ve done:

wget http://www.fdos.org/bootdisks/autogen/FDOEM.144.gz
gunzip FDOEM.144.gz
mkdir /tmp/cdr
sudo mount -t vfat -o loop FDOEM.144 /tmp/cdr
sudo cp ~/NewBiosFiles/* /tmp/cdr
sudo umount /tmp/cdr
sudo apt-get install mkisofs
mkisofs -o newBIOS.iso -b FDOEM.144 FDOEM.144
cdrecord -v newBIOS.iso

I hope this can be useful if you need to upgrade the BIOS and don’t have a floppy (and in my case the BIOS also didn’t support USB boot using a PEN, in that case I could use unetbootin to make a bootable DOS pen like I normally do with other PCs.

 

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Ubuntustudio 9.10 (Karmic) beta

I’ve installed the Ubuntustudio 9.10 daily release today and it worked almost without a problem. It is working on my homestudio PC (AMD 780G chipset with a Athlon 64 X2 processor) where the previous Ubuntustudio 9.04 and 8.10 failed to boot and I had to use Ubuntustudio 8.04 or a custom built rt kernel for the 9.04 release. Now for the (few) problems:

  • Grub installation asked for including a menu item for the Windows installation already present on my PC, but it didn’t include the menuitem, so I had to include it manually
  • It detected the availability of restricted hardware drivers (ATI), but failed to install it
  • When using audio in realtime the system hangup from time to time, blocking eerything (keyboard, mouse), but leaving the ‘RT’ label on jack client flashing slowly.

So these are the first impressions, not bad for a beta release, extremely fast boot and shutdown time (it seems about half the time I had with 8.04, but didn’t measure it), and my homestudio PC hardware seems now do be (almost) supported :-) Continue reading

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Howto install Rackarrack on Ubuntu / Ubuntustudio 9.10 (Karmic)

Rackarrack is an excelent realtime guitar effect processor for Linux, unfortunately not yet included on Ubuntustudio.� I’ve followed this tutorial to install it on Ubuntustudio 9.10 beta (Karmic), and it worked very well, so I’m including here the steps necessary to do it (I suppose it would also work on previous Ubuntu versions):

Add all the necessary dependencies:

sudo aptitude install jackd libjack-dev libjack0.100.0-0 libjack0.100.0-dev libfltk1.1 libfltk1.1-dev libasound2-dev libxpm-dev aconnectgui

Add the necessary developer tools (compiler, make, etc):

sudo aptitude install build-essential

Get the Rackarrack source here, extract it, change to its directory and execute:

./configure

make

sudo make install

The original tutorial has a link to a .deb package for the amd64 architecture, I haven’t tested it.

Good luck!

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Books

I’m waiting for this book (I’ve ordered it from Amazon), as soon as I have it I post here my comments:

Guerilla Home Recording: How to Get Great Sound from Any Studio – (No Matter How Weird or Cheap Your Gear Is)

These are other home recording / production books I think that can be interesting:

Free Software for Creative People: Building Digital Media with Blender, GIMP, Scribus, Audacity, and More

Digital Audio Workstation

Any other recommended book? Please comment Wink

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