Screencasts refer to video recordings of screen activity, often with narration. These can be used to demonstrate software or to serve as a kind of visual HOWTO. We often make screencasts of software we design in the Medical Visualisation group at the TU Delft to use in presentations at conferences or to distribute online.
On Windows, Camtasia Studio ($300) or Camtasia SnagIt ($40) are probably the best options your money can buy. Most of the free alternatives suck quite badly: This includes the Windows Media Encoder, thank you very much. In fact, the Windows Media 9 Screen Capture Codec has been fine-tuned to create the worst possible quality movies you can imagine. Another problem with the free options is that they often can’t sustain writing the video stream to disk, hence resulting in dropped frames and unusable screencasts. When they are able to sustain writing, it probably means that the compression is completely killing video quality.
Fortunately, it turns out that there is a free option which offers comparable performance to the Camtasia products, and for good reason. It’s called CamStudio, and it’s even open source! It’s terribly important that you also install the lossless CamStudio Screen Capture codec, it’s this that makes all the difference. This codec compresses all frames with the fast LZO lossless compression algorithm, so you get the highest possible quality without dropping frames due relatively slow disc writing.
Using CamStudio, I made a 3.5 minute screencast, with live audio recording, show-casing some of the new DICOM browsing functionality in the next DeVIDE release. After capture, I transcoded the CamStudio screen capture codec AVI to XVID using MediaCoder, and then uploaded to YouTube (play at your own risk!):
