Vimalkumar Velayudhan


Creating an Online Course using Free and Open Source Software

I published my first online course on Udemy recently. It is about creating a website and blog (like this one) using programs written in Python. This post is about the software I used for creating course content - screencasts with audio, lecture notes and an eBook. This was done on an Ubuntu Linux machine with free and open source software.

Recording Screencasts with Kazam§

For recording screencasts (recording actions on the desktop), I used Kazam. It is available in the Ubuntu software center. I saved the output as H264 (MP4).

These shorcuts were useful

CTRL + Super (Win) + R - Start recording

CTRL + SUPER (Win) + F - Finish recording

Recording Audio with Sound Recorder§

For recording audio, I used the sound recorder app on my Phone. Here are the settings I used

Sound Recorder - selecting high quality

Sound Recorder - effects

Editing Audio with Audacity§

I imported the *.ogg files produced from the recording into Audacity. Audacity is available in the Ubuntu software center. For Windows, you can download the installation package from Audacity’s website.

For processing the audio, I followed instructions from this youtube video. At times, noise removal alone was sufficient to get nice sounding audio. I also removed (CTRL + X) or silenced parts of the audio that I didn’t need.

Edit → Remove Audio or Labels → Silence Audio

Editing Videos with Blender§

Combining screencasts with audio was done using Blender Again, Blender is available in the Ubuntu software center. A version for Windows can be downloaded from the Blender website.

Blender could be overwhelming at first. Here is a tutorial on using the video editing feature.

Here is a sample Blender project (4MB, zip), from my course (includes a .blend file, video and audio files). The final video produced from this project is available here (3MB, avi).

Some tips

  • Right click to select a clip (video or audio).
  • Right click and drag to move a clip.
  • Use mouse wheel to Zoom in/out.
  • Use CTRL + mouse wheel to move the view port.
  • X to remove a clip (when selected with a right click).
  • K to soft trim a clip. The clip can then be resized later.
  • SHIFT + K to trim a clip.

eBook and Lecture Notes§

Along with the video tutorials, I also included notes and an eBook. Here is a sample chapter (pdf). I used Sphinx and the rst2pdf extension for generating the PDF output.

Slide presentation§

For the slide presentation in the promo/intro video, I used reveal.js.


For designing the cover for the course and eBook, I used Inkscape and Gimp. For capturing screenshots, I used Shutter.

If you have any questions or comments on this post, please send them by email to vimal (at) disroot (dot) org.

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