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Record Your Desktop With recordMyDesktop - page 3

Show and Tell

  • June 5, 2008
  • By Carla Schroder
There are two ways to add a soundtrack during your initial recording. (You can also edit your movies with Cinelarra or Kino, and do all kinds of fancy editing, but that's a subject for another day.) One way is to capture the audio from the applications you are recording, such as the sound effects and music from games. Another one is to use a microphone. As always with Linux, there are a multitude of ways to get there, so we'll start with the simplest.

With a bit of luck you can capture full audio and video for your screencast. Let's suppose you're creating the ultimate How to Master Frozen Bubble tutorial; it's no good without the sounds. The first thing you need to do is open your sound mixer- probably KMix, Gnome Mixer, or Alsamixer. My main PC has the seriously cheapskate onboard AC97 sound. Look for a mix or wave option in your mixer and enable it, and possibly a capture option. mix refers to the sound that is mixed for output to your speakers, and recordMyDesktop can use this as a recording source. Figure 1 shows how it looks in Alsamixer.

Now fire up whichever graphical frontend you want to use for recordMyDesktop, and use the kernel name to specify the recording device, as Figure 2 shows.

On the Performance tab, make sure everything is disabled. Record fullscreen or select part of the screen, and then hit Record. Look for a plain square button in your system tray; this shows that you're recording. This button also does Pause and Stop. When it changes to red that shows that you're stopped. Then it will encode your capture, which you must not interrupt or it's lost. You should now have full glorious sound and video.

What if you want to use a microphone, or have multiple sound cards? Visit Resources for a head start, and we'll get into all of this next week. Be sure to read the excellent user documentation at recordMyDesktop, and visit the user forums at SourceForge.

Resources

Carla Schroder is the author of the Linux Cookbook and the newly-released Linux Networking Cookbook , and is a regular contributor to LinuxPlanet.

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