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DIAL – Ein Bigbluebutton-Basiertes System Für Interaktive Live-Übertragungen Von Vorlesungen

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DIAL – Ein Bigbluebutton-Basiertes System Für Interaktive Live-Übertragungen Von Vorlesungen DIAL – Ein BigBlueButton-basiertes System für interaktive Live-Übertragungen von Vorlesungen Luise Kaufmann1, Tobias Welz2, Andreas Thor2 1 T-Systems International GmbH 2 Hochschule für Telekommunikation Leipzig Motivation Problem: Studierendenzahlen übersteigen Hörsaalkapazität Lösungen • Größeren Hörsaal bauen / anmieten • „Kommen sowie nicht alle zur Vorlesung“ • Aufteilung in Gruppen Vorlesung mehrfach halten • Live-Übertragung der Vorlesung in mehrere Hörsäle • Audio- und Video-Übertragung Web- • Folien, Annotation, … Konferenz- • Interaktion: Fragen stellen (Chat), Abstimmungen System? Andreas Thor, DIAL @ DeLFI 2017 2 Web-Konferenz-System (Bsp: BigBlueButton) Folien mit Annotationen Liste der Teilnehmer Chat Video / Audio Umfragen (Dozent) https://bigbluebutton.org/2017/05/25/bigbluebutton-1-1-released/ Andreas Thor, DIAL @ DeLFI 2017 3 Szenario: Web-Koferenz-System (naiv) Raum 1 Raum 2 Raum 3 Gute Idee? • WLAN im Hörsaal (Bandbreite, Re-Connect) • Steckdose? Weitere Nutzer • Unterschiedliche Interaktion • Studis@Home • Andere Standorte (HS) Raum 1 vs. andere Räume • „Alle gucken auf Tablet & Co“ Andreas Thor, DIAL @ DeLFI 2017 4 Je ein „normaler“ Web- Szenario: DIAL Konferenz-System-Nutzer pro Raum WLAN Raum 1 Raum 2 Raum 3 • Interaktion • Mediendaten (Umfragen, Chat) DIAL (Video & Audio) • Interaktion (Umfragen, Chat) Weitere Nutzer Andreas Thor, DIAL @ DeLFI 2017 5 DIAL: Übersicht DIAL = Distributed InterActive Lecture Robuste, einfache und skalierbare Live-Übertragung von Vorlesungen mit Interaktionsmöglichkeiten Schnittstelle für Interaktion Trennung der (voluminösen) Medien-Streams von (datensparsamen) Interaktionsnachrichten für Chat und Abstimmungen Web-App für Teilnehmer (Studierende) Einfache Interaktion per Smartphone ohne Notwendigkeit einer dauerhaften Verbindung Andreas Thor, DIAL @ DeLFI 2017 6 BigBlueButton • Web-Konferenzsystem • Audio, Video • Folien, Whiteboard • Screen-Sharing • Chat, Abstimmungen • Clients: Flash, HTML5 • Development • Open-Source erweiterbar • Integration mit anderen Systemen (Ilias, Moodle, …) • Sehr gute Erfahrungen an der HfTL • Teletutorium • Präsentationen durch Studierende Disclaimer: DIAL-Prinzip nicht auf BigBlueButton beschränkt Andreas Thor, DIAL @ DeLFI 2017 7 Architektur DIAL Chat Chat lesen schreiben powered Abfrage von by Teilnahme Umfragen an Umfragen DIAL Serverschnittstelle pull push BBB Client Redis MongoDB PubSub BigBlueButton-Kern Andreas Thor, DIAL @ DeLFI 2017 8 DIAL: Web-App (Screenshots) Andreas Thor, DIAL @ DeLFI 2017 9 Evaluation • Testvorlesung in zwei Räumen • Niedriger Ressourcenverbrauch (CPU Load, Datenverkehr) • Sichtbarkeit des Chats zum Teil Lösung in Murmelgruppe • Umfragen haben zentrale Bedeutung • Sicherstellung des Verständnisses für weiteren Verlauf der Vorlesung • Zeit für Dozenten um Chat zu lesen • Fehlendes non-verbales Feedback für Dozenten • Wunsch: Emojis für „Stimmung“, z.B. „zu schnell“ Andreas Thor, DIAL @ DeLFI 2017 10 Zusammenfassung DIAL powered • DIAL = Distributed InterActive Lecture by • Einsatz des Web-Konferenz-Systems BigBlueButton für einfache und skalierbare Live-Übertragung von Vorlesungen • Erweiterung von BigBlueButton um Schnittstelle und Web-App für Interaktion (Chat, Abstimmung) Andreas Thor, DIAL @ DeLFI 2017 11.
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