1 The eLecture Portal An Advanced Archive for Lecture Recordings Christoph Hermann, Wolfgang Hürst, Martina Welte Institut für Informatik Albert-Ludwigs-Universität.

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The eLecture PortalAn Advanced Archive for Lecture Recordings

Christoph Hermann, Wolfgang Hürst, Martina WelteInstitut für InformatikAlbert-Ludwigs-Universität Freiburg

[email protected]

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Overview

• Learning with eLectures• The eLecture-Portal

– Archiving

– Searching

– Podcasting

• Future Developments

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Learning with eLectures

• Current situation:almost all lectures are recorded

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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

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The eLecture-Portal: Archiving

• Archival of the entire computer science curriculum

• Other disciplines are also listed (Microsystems Engineering, Psychology...)

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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“)

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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

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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

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Current Work: Podcasting

• Converting the recorded lectures to podcasts

• RSS Feeds to inform the Students about new Recordings

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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