MP3 Link

Click here to listen to an MP3

Java Console for firefox

These rather cryptic command installs the java console addon for firefox.

$ cd /usr/lib/firefox-addons/extensions
$ sudo jar -xvf `find /usr/lib/jvm -name ffjcext.zip`

Maudio-1010LT and ubuntu 9.10

Initially I could get no sound with 9.10 after much research I managed to get a /usr/share/alsa/cards/ICE1712.conf that works!!


#
# Configuration for the ICE1712 (Envy24) chip
#

# default with dmix & dsnoop
ICE1712.pcm.default {
@args [ CARD ]
@args.CARD {
type string
}
type asym
playback.pcm {
type plug
slave.pcm {
@func concat
strings [ "dmix:" $CARD ",FORMAT=S32_LE" ]
}
}
capture.pcm {
type plug
slave.pcm {
@func concat
strings [ "dsnoop:" $CARD ",FORMAT=S32_LE" ]
}
}
}



ICE1712.pcm.front.0 {
@args [ CARD ]
@args.CARD {
type string
}
type asym
playback.pcm {
type route
ttable.0.0 1
ttable.1.1 1
slave.pcm {
type hw
card $CARD
}
slave.format S32_LE
slave.channels 10
}
capture.pcm {
type route
ttable.0.6 1 # I use 7/8 on the card for input
ttable.1.7 1 # change the 6 and 7 to suit.
slave.pcm {
type hw
card $CARD
}
slave.format S32_LE
slave.channels 12
}
}


# Original digital IO (not tested)
#


ICE1712.pcm.iec958.0 {
@args [ CARD AES0 AES1 AES2 AES3 ]
@args.CARD {
type string
}
@args.AES0 {
type integer
}
@args.AES1 {
type integer
}
@args.AES2 {
type integer
}
@args.AES3 {
type integer
}
type asym
playback.pcm {
type hooks
slave.pcm {
type route
ttable.0.8 1
ttable.1.9 1
slave.pcm {
type hw
card $CARD
}
slave.format S32_LE
slave.channels 10
}
hooks.0 {
type ctl_elems
hook_args [
{
interface PCM
name "IEC958 Playback PCM Stream"
lock true
preserve true
value [ $AES0 $AES1 $AES2 $AES3 ]
}
]
}
}
capture.pcm {
type route
ttable.0.8 1
ttable.1.9 1
slave.pcm {
type hw
card $CARD
}
slave.format S32_LE
slave.channels 12
}
}


envy24control does not work out of the box I got this ,

Unable to read peaks: No such file or directory

Install the latest alsa see

I installed everything from source (this overwrites the ICE1712.conf . . . fix it again!)

Java Media Framework (JMF) and ubuntu 9.10

Download and installing JMF

Down load the JMF installation from here

The install instructions don't work! But you can extract like this.

unzip jmf-2_1_1e-linux-i586.bin

Testing

To use initialise go into bin and

LD_PRELOAD=/usr/lib/libv4l/v4l1compat.so ./jmfinit

All the commands need this prefix because JMF uses an older version of vl4. To test

LD_PRELOAD=/usr/lib/libv4l/v4l1compat.so ./jmstudio

If you get this error

Exception in thread "JavaSound PushThread" java.lang.IllegalArgumentException: amount of data to read does not represent an integral number of frames
at org.classpath.icedtea.pulseaudio.PulseAudioTargetDataLine.read(PulseAudioTargetDataLine.java:152)
at com.sun.media.protocol.javasound.PushThread.process(JavaSoundSourceStream.java:790)
at com.sun.media.util.LoopThread.run(LoopThread.java:135)

You are probably using openjdk

update-java-alternatives -l
java-6-openjdk 1061 /usr/lib/jvm/java-6-openjdk
java-6-sun 63 /usr/lib/jvm/java-6-sun

Switch to the sun java

sudo update-java-alternatives -s java-6-sun

Streaming webcam via http

MJPG-streamer

Project at source forge


Youtube demo


mjpg_streamer -i "input_uvc.so -d /dev/video0" -o "output_http.so"
http://localhost:8080/?action=snapshot
http://localhost:8080/?action=stream

Animation

My animation setup for linux (ubuntu 9.10 i386).

I want to create animations from a sequence of capture images. This article describes the hardware and software set-up.

Camera

The Logitech QuickCam Pro 9000 Webcam is well support under linux works out of the box.

Controlling the Camera

To control the focus/exposure I am using guvciew. You need to run it a root to get all the features. Here is the app launcher and the controls you get.





























Software for capture and preview.

For assembling the images I use stopmotion

sudo apt-get install stopmotion

The video capture in stopmotion capture is done by specifying a command (a deamon that puts the webcam image into a JPG file which is then imported into stopmotion). Yo will need to install vgrabbj

sudo apt-get install vgrabbj

However the default command in stopmotion does not workout the box.
To make it work I replaced video import Start deamon command with

vgrabbj1 -f $IMAGEFILE -d $VIDEODEVICE -b -D 0 -i vga -L250

vgrabbj1 is a simple script that preloads a compatibility library.

#!/bin/sh
LD_PRELOAD=/usr/lib/libv4l/v4l1compat.so vgrabbj $*

Put this script somewhere in your PATH for example /usr/bin/

I also replaced the stop deamon command

killall vgrabbj

stopmotion also uses a script to export the video (created from the captured jpeg images). The default is:

ffmpeg -r 10 -b 1800 -i "$IMAGEPATH/%06d.jpg" "$VIDEOFILE"

Assembling and editing the clips.

I plan to use kdenlive. The default version 0.7.5 did not work very well (100% CPU and crashes). Instructions to install the latest version are here

Other software

gimp-gap might be useful for constructing animations using moving layers etc but I have not investigated.