Language Selection

English French German Italian Portuguese Spanish

Screencasting Under Linux--A brief Story

Filed under
Linux

My first consideration for making A/V screencasts under Linux is Software. What programs are available to do screen-recordings with simultaneous audio narration under Linux? I've probably tried them all: recordmydesktop (which has both gtk-recordmydesktop and qt-recordmydesktop GUI font ends), Istanbul, xvidcap, and wink. Frankly, none of these yielded the high-quality screen capture I wanted. But the real problem is that the audio quality was worse. After thrashing about, I finally end up with a non open source commercial product called DemoRecorder.

Now DemoRecorder is a commercial, proprietary program, which costs $47.00US, $77.00US, or $247.00US depending on the desired feature set. I purchased the $77.00 license. This does not work under Mandriva 2010 in nested desktop mode, but the openGL mode of capture works well. No dropped frames on the video side, and relativey smooth modion. On the audio side, no major sound glitches like I had with recordmydesktop.

Using DemoRecorder in the openGL mode is a two-phase process--Running the demorec --opengl program to perform the initial capture of the video and audio files, then the transcoding or assembly into a finished product using demorec-to-avi (or demorec-to-dv, demorec-to-flv, demorec-to-mpeg1, demorec-to-mpeg2, demorec-to-ogg-theora or whatever video codec/container you wish).

While the sound quality is considerably improved, it's still a bit hollow and tinny when recorded from my Logitech headset. I found the captured sound file produced by demorecorder, which I could then import into Audacity in raw format. I could then edit and improve the sound in Audacity, and export the edited sound file back to the drive before the assembly/transcoding of the video files and the sound file into one avi file.

This works--still, the sound isn't quite professional quality, but close. The real issue with this is that this type of post-production sound-editing takes a lot of time. Better, if possible, to get a high-quality sound recording to begin with, and bypass the editing step. Time for some research into sound production.

I have no experience in sound recording--I'm a computer guy, but I do like to play with hardware.
Fortunately, I already have a really good high-quality sound card in my working desktop computer--an HT Omega Claro Plus.

Turns out, you can get a decent quality mic, and a device called a sound mixer, and you can record really great sound. Good to know. I end up purchasing a Behringer XENYX 1204FX model mixer for $179.99US. This model of mixer turns out to be overkill on my part, and I now know I could have got by just fine with a cheaper mixer (prices for a mixer can range from $99.00US to several thousand US dollars).

As is often the case, one purchase often begets another. So, on to buy a decent, but relatively inexpensive condensor mike (after shelling out too many $$$ on the mixer). I end up purchasing an MXL 990 condenser microphone with a shock mount for $49.00US. Then a proLine desktop mic stand, model MS112 ($29.99US). Finally, I purchase assorted cables and adapters.

After all my sound gear arrives, I connect the mic to my mixer, the mixer to my sound card. Then I fire up Audacity to run some tests. After fiddling with the gear for about an hour, I'm amazed at the quality of the sound captures. Now I can start recording those educational screencasts in earnest.

More in Tux Machines

Eight great Linux gifts for the holiday season

Do you want to give your techie friend a very Linux holiday season? Sure you do! Here are some suggestion to brighten your favorite Tux fan's day. Read more Also: More Random Gift Ideas For Linux Enthusiasts & Others Into Tech Which open source gift is at the top of your holiday wish list?

Ubuntu-Based ExTiX OS Updated for Intel Compute Sticks with Improved Installer

GNU/Linux developer Arne Exton announced this past weekend the release of an updated build of his Ubuntu-based ExTiX Linux distribution for Intel Compute Stick devices. Last month, we reported on the initial availability of a port of the ExTiX operating system for Intel Compute Sticks, boasting the lightweight and modern LXQt 0.10.0 desktop environment and powered by the latest Linux 4.8 kernel, tweaked by Arne Exton for Intel Atom processors. And now, ExTiX Build 161203 is out as a drop-in replacement for Build 161119, bringing a much-improved Ubiquity graphics installer that should no longer crash, as several users who attempted to install the Ubuntu-based GNU/Linux distro on their Intel Compute Stick devices reported. Read more Also: Debian-Based SparkyLinux 4.5 Brings Support for exFAT Filesystems, systemd 232 4MLinux 20.1 Linux Distro Released with Kernel 4.4.34 LTS to Restore PAE Support

Today in Techrights

Canonical Releases Snapcraft 2.23 Snap Creator for Ubuntu 16.04 LTS and 16.10

Canonical's Snappy development team have released a new maintenance version of the Snapcraft 2.x tool that lets applications developers package their apps as Snap packages for Ubuntu and other GNU/Linux distributions that support Snaps. Read more