Crowdsourced, context-aware
OpenCourseWare
“Yale has spent $30,000 to
$40,000 for each course it
puts online”

Absurd, isn’t it?
http://www.nytimes.com/2010/04/18/education/edlife/18open
-t.html?pagewanted=all
New: Student-Sourcing

 Cost
 “with more than $14 million going to M.I.T…Only 33
of the 1,975 courses posted by M.I.T. have videos of
lectures”
 Speed of availability
 “I want to be able to review the courses I miss due to
job interviews”
 Multiple sources
 Better angles, better sound
New: Not Quite Videos

+
Advantages

 Size
 Video: 500 kbit/s
 75 minute lecture: 275 MB
 Photo: 0.4 MB for a 2048x1536
 100 slides (already a lot): 40
MB
 Audio: 64 kbit/s
 75 minute lecture: 35 MB
 Skimmable
Workflow

Record
• Onto
local
storage
Upload
• Onto
server
• Login
• Reencoding
Playback
• From
server
• HTML5
client
Authentication

Authentication

Recording

 Application lifecycle
 Background processes,
recording and device
management
 Device management
 Locks on cameras, etc.
Playback

Gapless HTML5 Playback
Future

 Multiple perspectives
in one timeline
 Video?
 Autofill location
 Social networking
Future
