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Recording Technique
Most of the videos have been recorded using a Windows Tablet PC (Toshiba Portégé M400)
and a USB microphone (Samson Go Mic). For some videos, I have used a standard quad-core notebook computer or a
quad-core desktop PC in conjunction with a Wacom Bamboo or a Wacom Cintiq graphics tablet.
The software is either included in Microsoft Windows or comes free:
Windows Journal
for drawing, PenAttention to highlight
the position of the stylus, HyperCam 2.x for recording
(be sure to set its process to high priority in Windows Task Manager to avoid audio/video drift),
Xvid for video compression,
Virtual Dub for editing (if need be).
Over time, I have developed additional software to streamline production and presentation:
- a helper tool called Video StopWatch (download) for HyperCam that includes a stop watch, enables me to save
markers during the recording (for instance to know what I have to edit out),
shows the CC logo at the start of the recording, and inserts a fade to white
when I pause the recording, e.g. to discuss with the class,
- a tool to insert a live web cam shot of the lecturer’s head with no window frame and no background,
- a MATLAB® script to extract black-and-white images from photographs
of green chalkboards,
- a complete recording solution (demo video, preprint)
to simulate writing on a whiteboard or on a
transparent board using a graphics tablet and a webcam,
- a nimble video editor (demo video)
with a condensed but precise overview display,
speech recognition, and a novel audio waveform display,
- the EquationLens
bookmarklet (click right and add to your bookmarks)
for Firefox to turn ASCII equations in YouTube comments into legible MathML
and to send YouTube comments anonymously,
- a filter for VirtualDub to remove sketches made in cyan so that one can use them similar to a teleprompter during recording,
- a writing and sketching tool for Android tablets with recording functionality (work in progress).
Additional material for German readers/viewers:
- DeLFI 2011 paper, starts on page 91
- ICM 2012 slides
- Duisburg Learning Lab 2012 video