1 - Capturer Lecture Video Recording System
Tel Aviv University (TAU), Israel
System Description
Capturer works on Microsoft based operating systems (XP, Win7). It
integrates the video of the lecturer with his computer desktop
activities (Video Graphics Array (VGA) signal) in real time and within
the same frame. Events filmed using Capturer can be broadcast live, including both VGA and video
signals. The recording output is a single video file, by default Microsoft Windows Media Video (WMV),
but it can easily be converted to any other video format. The management interface enables
watermarking of branding marks and a banner display at the bottom and/or side of the video. The
bottom or side banner can be changed while the recording is ongoing. Capturer has been used at TAU
for six years and in two other universities in Israel for a couple of years. TAU also provides lecture
capture services for many European Union (EU) projects such as Nano2Life, NanoSkills, NanoEl and
QNano. There also exists a special version of Capturer, which has been customised to enable a lecturer
to simultaneously record his or her lecture and presentation using only a laptop.
Features
• Real-time video enhancement by Capturer while recording and live webcasting (ability to
change the lecturer's video contrast, colour intensity, brightness and sharpness).
• Large video frame 960x540 (high video rate, typically 20 FPS (frames per second) for the
video and lecturer's screen capture).
• Supports various types of video inputs (Firewire, composite video, S-video, USB webcam and
internal laptop webcam). Currently experimenting with high definition (HD) IP cameras.
• Machete software enables very efficient and fast video editing, including start and end point
trimming, inserting and chaining video clips.
• Windows stream editor enables adding or replacing complete audio tracks.
• FreeMake converts Capturer output to any video encoding codec formats.
• The system uses TauWebcast open source JOOMLA as a Content Management System (CMS)
for distribution, metadata, and user access control based on the TAU Lightweight Directory
Access Protocol (LDAP).
• The MOODLE Learning Management System (LMS) is in use for course recordings.
• The JOOMLA CMS uses the YouTube Application Programming Interface (API) and
automatically uploads an instance of each video to the TAU branded YouTube channel,
including its metadata.
• The video streaming servers are proprietary Windows Media Server and open source Red5
Flash Media Server.
• Some of the recordings are uploaded to the Matterhorn 1.3 installation and can be played
back by the Matterhorn player with video Optical Character Recognition (OCR), which is used
to scan materials and identify text on slide captures. Indexing is done by the Matterhorn
video processing engine.
• For the basic configuration no hardware is needed for Capturer other than a video camera
with Firewire output, laptop and tripod (very low cost).
• The recording equipment can be set up at the required location (typically a classroom or
lecture hall) in less than five minutes.
(110 stránky)
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