1
The eLecture PortalAn Advanced Archive for Lecture Recordings
Christoph Hermann, Wolfgang Hürst, Martina WelteInstitut für InformatikAlbert-Ludwigs-Universität Freiburg
2006-09-12 Christoph Hermann - Universität Freiburg - Institut für Informatik 2
Overview
• Learning with eLectures• The eLecture-Portal
– Archiving
– Searching
– Podcasting
• Future Developments
2006-09-12 Christoph Hermann - Universität Freiburg - Institut für Informatik 3
Learning with eLectures
• Current situation:almost all lectures are recorded
2006-09-12 Christoph Hermann - Universität Freiburg - Institut für Informatik 4
Production
• Live-recording during the lecture using a microphone and a “Wacom desk”
• Only minor postprocessing by one student required; mostly automatic
• A few hours after the lecturethe recordings are online
2006-09-12 Christoph Hermann - Universität Freiburg - Institut für Informatik 5
The eLecture-Portal: Archiving
• Archival of the entire computer science curriculum
• Other disciplines are also listed (Microsystems Engineering, Psychology...)
2006-09-12 Christoph Hermann - Universität Freiburg - Institut für Informatik 6
Searching
• Automatic indexing of all lectures– Slides
– Metadata
– Audio
• Automatic speech transcription to index additional data
• Mapping of original slides to the recorded document
• Optimized user interface (e.g. “one-click” access to position of the “hit“)
2006-09-12 Christoph Hermann - Universität Freiburg - Institut für Informatik 7
Getting the most out of the documents
• Analyzing metadata– title, author, date, ... – additional manual editing is too time
expensive• Grabbed presentations
=> matching of original slides with the recorded presentation
• Audio transcription1. audio extraction2. automatic processing of the recorded
speech to textual information3. indexing files
2006-09-12 Christoph Hermann - Universität Freiburg - Institut für Informatik 8
Some statistics
• Whole computer science curriculum can be accessed online
• One lecture has between 10 and 100mb (varies depending on the format)
• ~ 50.000 visits this year already (~ 5000 visits/month)
• ~ 6000 hits/day• 25 TB data downloaded
(in 2006 so far)• ~ 3-600 gb/month
2006-09-12 Christoph Hermann - Universität Freiburg - Institut für Informatik 9
Current Work: Podcasting
• Converting the recorded lectures to podcasts
• RSS Feeds to inform the Students about new Recordings
2006-09-12 Christoph Hermann - Universität Freiburg - Institut für Informatik 10
Conclusion/Outlook
• Heavy use of the portal by our students
Problem of handling such a large amount of data
Consider enhancing and changing technologies (e.g. Podcasting)
Permission problem- Professors don‘t want their material to be
accessible by everyone Property rights?
- Stealing/trading of contents