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Screencasting Under Linux--A brief Story

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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

Leftovers: Software

Linux and FOSS Events

  • Debian SunCamp 2017 Is Taking Place May 18-21 in the Province of Girona, Spain
    It looks like last year's Debian SunCamp event for Debian developers was a total success and Martín Ferrari is back with a new proposal that should take place later this spring during four days full of hacking, socializing, and fun. That's right, we're talking about Debian SunCamp 2017, an event any Debian developer, contributor, or user can attend to meet his or hers Debian buddies, hack together on new projects or improve existing ones by sharing their knowledge, plan upcoming features and discuss ideas for the Debian GNU/Linux operating system.
  • Pieter Hintjens In Memoriam
    Pieter Hintjens was a writer, programmer and thinker who has spent decades building large software systems and on-line communities, which he describes as "Living Systems". He was an expert in distributed computing, having written over 30 protocols and distributed software systems. He designed AMQP in 2004, and founded the ZeroMQ free software project in 2007. He was the author of the O'Reilly ZeroMQ book, "Culture and Empire", "The Psychopath Code", "Social Architecture", and "Confessions of a Necromancer". He was the president of the Foundation for a Free Information Infrastructure (FFII), and fought the software patent directive and the standardisation of the Microsoft OOXML Office format. He also organized the Internet of Things (IOT) Devroom here at FOSDEM for the last 3 years. In April 2016 he was diagnosed with terminal metastasis of a previous cancer.
  • foss-gbg on Wednesday
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Leftovers: OSS

  • When Open Source Meets the Enterprise
    Open source solutions have long been an option for the enterprise, but lately it seems they are becoming more of a necessity for advanced data operations than merely a luxury for IT techs who like to play with code. While it’s true that open platforms tend to provide a broader feature set compared to their proprietary brethren, due to their larger and more diverse development communities, this often comes at the cost of increased operational complexity. At a time when most enterprises are looking to shed their responsibilities for infrastructure and architecture to focus instead on core money-making services, open source requires a fairly high level of in-house technical skill. But as data environments become more distributed and reliant upon increasingly complex compilations of third-party systems, open source can provide at least a base layer of commonality for resources that support a given distribution.
  • EngineerBetter CTO: the logical truth about software 'packaging'
    Technologies such as Docker have blended these responsibilities, causing developers to need to care about what operating system and native libraries are available to their applications – after years of the industry striving for more abstraction and increased decoupling!
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  • Want OpenStack benefits? Put your private cloud plan in place first
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  • Set the Agenda at OpenStack Summit Boston
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Proprietary Traps and Openwashing

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  • Open Source WSO2 IoT Server Advances Integration and Analytic Capabilities
    WSO2 has announced a new, fully-open-source WSO2 Internet of Things Server edition that "lowers the barriers to delivering enterprise-grad IoT and mobile solutions."
  • SAP license fees are due even for indirect users, court says
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  • “Active Hours” in Windows 10 emphasizes how you are not in control of your own devices
    No edition of Windows 10, except Professional and Enterprise, is expected to function for more than 12 hours of the day. Microsoft most generously lets you set a block of 12 hours where you’re in control of the system, and will reserve the remaining 12 hours for it’s own purposes. How come we’re all fine with this? Windows 10 introduced the concept of “Active Hours”, a period of up to 12 hours when you expect to use the device, meant to reflect your work hours. The settings for changing the device’s active hours is hidden away among Windows Update settings, and it poorly fits with today’s lifestyles. Say you use your PC in the afternoon and into the late evening during the work week, but use it from morning to early afternoon in the weekends. You can’t fit all those hours nor accommodate home office hours in a period of just 12 hours. We’re always connected, and expect our devices to always be there for us when we need them.
  • Chrome 57 Will Permanently Enable DRM
    The next stable version of Chrome (Chrome 57) will not allow users to disable the Widevine DRM plugin anymore, therefore making it an always-on, permanent feature of Chrome. The new version of Chrome will also eliminate the “chrome://plugins” internal URL, which means if you want to disable Flash, you’ll have to do it from the Settings page.