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README
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Panda is a Merb app which runs on a special EC2 instance to encode videos for you. Uploaded videos are stored on S3 with a small amount of info kept in SimpleDB. The REST API makes it easy to integrate user video uploading into your web application.
How does Panda work?
====================
1. Video is uploaded to panda
2. Panda checks the video's metadata, uploads the raw file to S3 and adds it to the encoding queue
3. The encoder application picks the encoding job off the queue when it's free and encodes the video to all possible formats
4. Panda sends a callback to your web application notifying you the video has been encoded
5. You use the S3 url of the encoding you want to show to your users
Installation and setup
======================
Gems
----
Merb 0.9.2
S3 (http://amazon.rubyforge.org/)
SimpleDB (http://nytimes.rubyforge.org/amazon_sdb/)
gem install merb merb_helpers activesupport RubyInline amazon_sdb sqs
Other deps
----------
# libjpeg
http://www.ijg.org/
http://www.libgd.org/FAQ#gd_keeps_saying_it_can.27t_find_png_or_jpeg_support._I_did_install_libpng_and_libjpeg._What_am_I_missing.3F
# libgd
http://www.libgd.org/Main_Page
RVideo
------
Build gem from svn://rubyforge.org/var/svn/rvideo/trunk with `rake install_gem`.
Then `sudo cp lib/rvideo/tools/*.rb /Library/Ruby/Gems/1.8/gems/rvideo-0.9.4/lib/rvideo/tools/` on OS X.
FFMPEG
-----
Available in all good package repositories including Darwin Ports.
If you're developing on Mac OS X, you can grab ffmpeg out of the ffmpegX application instead of compiling it: http://www.macosxhints.com/article.php?story=20061220082125312
Configuration
=============
Encoding profiles
-----------------
Profile.create!(:title => "MP4 SD", :container => "mp4", :video_codec => "mpeg4", :video_bitrate => 300, :audio_codec => "aac", :audio_bitrate => 48, :audio_sample_rate => 48000, :width => 320, :height => 240, :fps => 24, :position => 2, :player => nil)
Profile.create!(:title => "Flash video SD", :container => "flv", :video_bitrate => 300, :audio_bitrate => 48, :width => 320, :height => 240, :fps => 24, :position => 0, :player => "flash")
Profile.create!(:title => "Flash video HI", :container => "flv", :video_bitrate => 400, :audio_bitrate => 48, :width => 480, :height => 360, :fps => 24, :position => 1, :player => "flash")
Profile.create!(:title => "Flash h264 SD", :container => "mp4", :video_bitrate => 300, :audio_codec => "aac", :audio_bitrate => 48, :width => 320, :height => 240, :fps => 24, :position => 2, :player => "flash")
Profile.create!(:title => "Flash h264 HI", :container => "mp4", :video_bitrate => 400, :audio_bitrate => 48, :audio_coded => "aac", :width => 480, :height => 360, :fps => 24, :position => 3, :player => "flash")
Profile.create!(:title => "Flash h264 480p", :container => "mp4", :video_bitrate => 600, :audio_bitrate => 48, :audio_coded => "aac", :width => 852, :height => 480, :fps => 24, :position => 4, :player => "flash")
Further information
===================
Investigating encoding errors
-----------------------------
When an encoding fails the status of the video is set to 'error' and the output of ffmpeg is saved on S3 with the filename video_token.error
SimpleDB schemas
================
Videos
------
filename # 976a4b00-16cc-012b-7316-001ec2b5c0e1.flv
original_filename # sneezing_panda.flv
parent
status # original, queued, processing, done, error
duration
container
width
height
video_codec
video_bitrate
fps
audio_codec
audio_sample_rate
profile # id of encoding profile used
profile_title
updated_at
created_at
Encoding profiles
-----------------
title
container
width
height
video_codec
video_bitrate
fps
audio_codec
audio_bitrate
audio_sample_rate
updated_at
created_at