Bootstrapping

• Create virtualenv and install Pyramid

easy_install virtualenv
virtualenv pyramid
source pyramid/bin/activate
easy_install Pyramid==1.0

• Run project

source pyramid/bin/activate
cd slideshow
python setup.py develop
paste server development.ini

Browser to the development server

http://127.0.0.1:6543/

Production run

Log in as slideshow user and start WSGI server through screen:

script /dev/null # enable screen under sudo
screen -x
source ~/pyramid/bin/activate
paster serve production.ini

Install Echo Nest Remix

Echo Nest Remix API works by uploading data to Echo Nest servers for audio analysis. First MP3 is decoded with ffmpeg and then raw data is uploaded(?).

Needed for beat analysis. You need have ffmpeg development files installed:

# TODO - don't know what do here
# Try Medibuntu repos?

Then install Echo Nest remix API:

source pyramid/bin/activate
svn checkout http://echo-nest-remix.googlecode.com/svn/trunk/ echo-nest-remix
cd echo-nest-remix
# Apparently this puts some crap to /usr/local and /usr/local/bin
sudo python setup.py install
sudo ln -s `which ffmpeg` /usr/local/bin/en-ffmpeg

Install Selenium

Selenium is used for frame recording by remote controlling a Firefox browser which connects to localhost running Pyramid.

source pyramid/bin/activate
wget http://selenium.googlecode.com/files/selenium-server-standalone-2.0rc2.jar
easy_install selenium

Install PIL

source pyramid/bin/activate
easy_install http://dist.repoze.org/PIL-1.1.6.tar.gz

Recording a video

Run Selenium in a recording mode.

This will

• Spawn Pyramid server on localhost:6543
• Open a Selenium driven Firefox on /recorder on the server
• Control the execution of the Javascript on the page, make yield each animation frame individually
• Encode frames to base64 PNG data URIs
• Feed frames from Firefox to Python process through Selenium (using strings)
• Decode frames in Python
• Save decoded frames as RGB raw data to a stream (/tmp/data.raw)

source pyramid/bin/activate
python slideshow/recoder.py /tmp/data.raw # Will start Firefox + Pyramid  and output frame data to this file

Then you can encode this:

gst-launch-0.10 filesrc location=../work/mixsnap/foo.raw blocksize=918528 ! \
    'video/x-raw-rgb,bpp=24,endianness=4321,depth=24,red_mask=16711680,green_mask=65280,blue_mask=255,width=736,height=416,framerate=30/1' !\
     ffmpegcolorspace ! videorate ! x264enc profile=baseline ! mux. \
     filesrc location=josh.ogg ! decodebin ! audiorate ! audioconvert ! faac ! mux. \
     mp4mux name=mux ! filesink location=foo.mp4

Music

Out of the box music CC Licensed

• http://www.jamendo.com/en/artist/Emerald_Park
• http://www.jamendo.com/en/artist/manguer

Adding your own songs

Drop in your MP3 files in music folder.

You need Echo Nest API key

• http://developer.echonest.com/

Rerun beatme.py to generate beat data as JSON:

# NOT A REAL KEY
export ECHO_NEST_API_KEY=DH2I0GRG9VSVPDH
python beatme.py

Videos

• http://www.motionshare.com/free-videos/viewvideo/81/ambient-colour-backgrounds/enthroned-forever-slide-sd/Page-1.html

Sources

• http://oksoclap.com/canvasoptimizations
• http://echo-nest-remix.googlecode.com/svn/trunk/apidocs/index.html
• http://lindsay.at/work/remix/overview.html
• http://code.google.com/p/echo-nest-remix/
• https://github.com/jquery/jquery-mobile

Tools

• http://www.online-convert.com/result/13bdb358a38f203f74217281f9711a1d

• ffmpeg2theora http://v2v.cc/~j/ffmpeg2theora/download.html

• GStreamer: install these:

  gstreamer0.10-ffmpeg gstreamer0.10-fluendo-mp3 gstreamer0.10-gnonlin gstreamer0.10-nice gstreamer0.10-plugins-bad gstreamer0.10-plugins-bad-multi gstreamer0.10-plugins-base gstreamer0.10-plugins-base-apps gstreamer0.10-plugins-good gstreamer0.10-plugins-ugly gstreamer0.10-plugins-ugly-mult gstreamer0.10-pulseaudio gstreamer0.10-tools gstreamer0.10-x