Running a Net Radio Station With Open-Source Software
To start Liveice, go into the /usr/local/liveice/bin and run liveice. You must be able to connect to the broadcast server for Liveice to start correctly. Figure 3 is a screen shot of what Liveice looks like when started.
We did not encounter any problems with either the LAME or Liveice setup and configuration. They conform to the open-source standard and are very simple to set up.
We purchased an audio mixer that allows multiple microphones to send audio into the line-in port on the sound card. xqmixer recognizes the sound card as audio in to send the stream through LAME to be encoded and send output through the Liveice client. After the Liveice client receives the input, the client streams the output over the Internet to our Icecast server. Icecast receives the stream from Liveice and relays it back to the Internet in an MP3 format to be interpreted by any MP3 decoder client that our listeners choose to use. Xmms and Winamp seem to be the most popular programs to decode MP3 streams.
The mixer provides a greater range of input options. We can run a CDROM, microphones or an MP3 player right into the mixer and out to the Internet. The open-source radio show runs a full range of input to give the true radio feel when we broadcast. We use an audio mixer with six ports for input. Each host has his own microphone that jacks into the mixer, which then connects into the line-in port of the sound card. Any device that generates audio output can be plugged into the line-in port on the sound card.
Liveice requires specific audio input quality. The sound card, while it receives input, is still controlled by the tools within the operating system. In our case we use xqmixer to control the sound card hardware. On xqmixer, the record volume controls the streaming rate that Liveice receives as input. If the record volume is set too low, you will not hear any output. If it is set too high, Liveice clips the audio. Clipping is an audio engineering term that describes what happens when the audio signal is too strong for the hardware to handle—it “clips” off part of the signal, making it sound terrible. We adjusted our sound quality by tuning the record volume. It's simple: fire up your station and listen to yourself. If you do not hear anything, increase the record volume. If the playout is clipping, reduce the record volume until you get it right.
The http://www.opensourceradio.com/ show runs every Thursday night from 8:00 P.M. to 10:00 P.M. EST. We discuss open-source issues and use the full range of our mixing and MP3 conversion capabilities. Anyone can do what we have done. With the exception of the mixer, the computer hardware and the T1 connection, everything was free. You can easily download all of the software from the Internet to create an Internet radio station. We would also like to say that despite our sound, no small animals are injured during the course of our broadcast.
Practical Task Scheduling Deployment
One of the best things about the UNIX environment (aside from being stable and efficient) is the vast array of software tools available to help you do your job. Traditionally, a UNIX tool does only one thing, but does that one thing very well. For example, grep is very easy to use and can search vast amounts of data quickly. The find tool can find a particular file or files based on all kinds of criteria. It's pretty easy to string these tools together to build even more powerful tools, such as a tool that finds all of the .log files in the /home directory and searches each one for a particular entry. This erector-set mentality allows UNIX system administrators to seem to always have the right tool for the job.
Cron traditionally has been considered another such a tool for job scheduling, but is it enough? This webinar considers that very question. The first part builds on a previous Geek Guide, Beyond Cron, and briefly describes how to know when it might be time to consider upgrading your job scheduling infrastructure. The second part presents an actual planning and implementation framework.
Join Linux Journal's Mike Diehl and Pat Cameron of Help Systems.
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|SUSE LLC's SUSE Manager||Jul 21, 2016|
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- Stunnel Security for Oracle
- The Firebird Project's Firebird Relational Database
- Murat Yener and Onur Dundar's Expert Android Studio (Wrox)
- SUSE LLC's SUSE Manager
- Managing Linux Using Puppet
- My +1 Sword of Productivity
- Non-Linux FOSS: Caffeine!
- Doing for User Space What We Did for Kernel Space
- Google's SwiftShader Released
- SuperTuxKart 0.9.2 Released
With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide