Cisco Digital Video Recorder in Stand-Alone Mode Bedienungsanleitung PDF herunterladen (Seite 15)

4 – L2L (Live to e-Learning)

InternUniversity Consortium, CINECA, Italy

System Description

The L2L service allows a semi-automatic transformation of live lectures into e-

learning activities ready for publication and delivery through an e-learning

platform. The service is designed to address the needs of a consortium of

universities, balancing the requirements of each university and the need to

contain costs. A single centralised Digital Asset Management (DAM) system,

based on the open source platform MediaMosa, is used to handle all the

multimedia content and metadata. A plug-in integrates the DAM system with

the open source learning management system Moodle. The overall architecture is open and modular

allowing both the deployment of different service models and the seamless re-use of the digital

content in different contexts (e.g. e-learning platforms, web portals, WebTV).

The three main components of the L2L service are the L2L Recorder, the DAM platform and the

Moodle module. The L2L recorder is able to record and synchronise one audio source and two video

sources such as screen capture of the teacher’s desktop, external video source, or output of an

interactive whiteboard. The L2L station is based on a PC, with an audio/video capture card and a

VGA2USB capture device. The L2L software is a MS Windows .NET application and the audio/video

streams are encoded in high quality WMV format.

The lecture capture process involves the following steps:

• Selection of the capture mode: the L2L client supports different recording types (audio only,

teacher’s audio-video, screencast, teacher’s audio-video and a secondary video) in order to

best suit the teacher’s needs.

• Insertion of attachments into the lesson.

• Description of the lesson: title, abstract and tags.

• Recording phase.

• Quality control: the user is able to check the recording quality using a preview player.

• Load to the repository: transparently to the user.

• An upload management process schedules the upload in the repository where the ingestion

process takes place.

Thanks to a specific L2L MS Office 2007/2010 plug-in, it is possible to capture the change of

presentation slides. The same plug-in includes the slide snapshots and an XML (Extensible Markup

Language) file containing the slides’ texts in the L2L package. The L2L recorder supports offline

recording in order to address common scenarios where the lectures take place in a room not

connected to a network or when a teacher prefers to record a complete set of lectures before

uploading these to the DAM. The DAM platform integrated into L2L is based on the MediaMosa

platform. MediaMosa, a free and open source software, is used to build a web-service oriented media

management and distribution platform, providing multimedia content delivery. A MediaMosa-based

DAM platform offers its users the functionality for searching, playing, uploading and transcoding, as

well as a fine granularity media access control system. MediaMosa implements the four main system

functionalities - ingest, store, manage and publish – through a large set of REST API calls. The

MediaMosa content model relies on assets and mediafiles: an asset is composed of a set of mediafiles

(the original one and all the transcoded versions). This allows the same asset to be delivered using a

number of different protocols and formats. The integration of the repository and the learning

management system allows for the managing, publishing, and delivering of the L2L lessons. A Moodle

interface to the DAM has been developed and, according to the Moodle paradigm, a module

implementing a L2L Moodle e-learning activity has been realised. The L2L block enables authorised

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