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hpr_transcripts/hpr0845.txt

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+Episode: 845
+Title: HPR0845: Open Source Radio Software
+Source: https://hub.hackerpublicradio.org/ccdn.php?filename=/eps/hpr0845/hpr0845.mp3
+Transcribed: 2025-10-08 03:23:46
+
+---
+
+Hello, Okondie here, and today on Hackup Public Radio, I'd like to talk to you about free
+software designed for broadcast and internet radio.
+The most important piece of software for internet radio is icecast.
+This is the server software for the audio stream, allowing anyone connecting to it to listen.
+It encodes the stream in multiple formats according to your needs, and can be used to
+relay the stream to other servers to spread the system load.
+Icecast requires an audio feed so that it has something to broadcast.
+The simplest application is called BUT, which stands for a broadcast using this tool.
+You can set up BUT to stream from an audio input on your sound card to the icecast server.
+Another application is called internet DJ console.
+Unlike BUT, IDJC is a full radio tool with dual playlists, jingle buttons, and it uses
+the jack audio connection kit, and so can do other clever things with routing audio
+from program to program.
+Either of these programs can give you all you need for live broadcasts to the internet.
+However, what if you want 24 hour programming without having a desktop machine with streaming
+constantly?
+Icecast can play an off-air track, but that's not very flexible.
+Here is where liquid soap comes in.
+Liquid soap is a server demon and scripting language to describe an output audio streams.
+For example, if you wanted a playlist of music to be played one after another out of your
+local sound card, you would give liquid soap a script like this.
+Music equals playlist, open brackets, home slash user slash music, close brackets, then
+output dot ulcer, open bracket music, close bracket.
+Playlist and output dot ulcer are functions, so they have all sorts of variables.
+Playlist has one for randomizing the music track to be played, or refreshing the playlist.
+Output has all sorts of options with different formats, codecs, and devices.
+This being a script, you can build it like a computer program.
+What if you wanted to randomly mix in jingles to the playlist?
+Then you would add a line which would redefine music as music with a random chance of picking
+the jingle track instead of the music.
+The most powerful element of the script is the fallback function.
+This allows the stream to prioritize one audio source over another.
+For example, if you had a live stream coming into liquid soap, you could have it interrupt
+the random playlist.
+When the stream ended, it would fall back to the playlist again.
+Another feature is a dynamic playlist, where using simple telnet commands, you can add
+tracks to a queue.
+Click this up to a web interface, and you can have listeners making requests.
+Liquid soap has just hit a version 1 release, and I haven't messed with it for a while,
+so I'm sure there were tons of features I have no idea about.
+I totally recommend checking out how powerful it is.
+Recently, I discovered a project called AirTime, which uses liquid soap as a back end for web-based
+scheduler.
+I've not worked with it extensively yet.
+But it does a lot of neat things to keep a multi-host automated radio station running.
+You can assign time blocks on a calendar to particular hosts.
+The hosts can then create playlists of audio for their blocks.
+Even the uploading of content is as easy as clicking and dragging the files into the browser.
+The only thing it doesn't have is a way of generating playlists itself, and avoiding
+dead air.
+But AirTime is on constant development, and this is planned.
+Once it uses liquid soap on the back end, it's simple enough to add a random playlist
+and music yourself to the script that AirTime runs.
+The biggest piece of Floss Radio software is Rivendell.
+Rock Study, dependable radio automation.
+Build another proven Linux platform.
+You're experiencing Rivendell radio automation.
+This is different to what I've discussed so far, in that this is designed for a traditional
+broadcast radio station with dedicated work stations.
+It runs a MySQL database combined with a shared network storage to catalogue all the music
+and audio.
+There is a suite of applications including AirPlay, a touchscreen-friendly device for DJs
+and hosts.
+It can generate playlists of music specific to your needs, for example, avoiding the same
+artist in a row or no more than 380s tracks per hour.
+It has a Dropbox system allowing you to dump a ton of tracks into one folder, and it
+will automatically process them and add them to the database.
+And with the database just a MySQL server, it can be easily moved, backed up and restored.
+Seriously now, don't you have better uses for $15,000?
+This is the open source Rivendell radio automation system.
+The newest version incorporates a web interface for uploading tracks and modifying the database.
+Rivendell can be tough to set up, and the documentation is a bit lacking for newbies.
+But for a good demo, check out the neat Ubuntu Live CD called RRA Ubuntu.
+You can even install it, and within 30 minutes have a fully set up system.
+It runs on ALSO primarily, but there is good jack support if you can set it up.
+The best radio automation system you'll never pay for.
+Rivendell radio automation.
+I'm probably going to be doing a lot more with all these technologies on my day job as I'm helping with a student radio station.
+We've had a liquid soap random playlist with jingles, live streams and requests for a while now,
+and we'll soon be moving to a full on radio station in the next few months.
+So Rivendell will hopefully be a big part of that.
+I will likely do another episode about my experiences.
+This is Ork on DK.
+Thanks to the projects I talked about, we'll be in the show notes, along with ways to contact me.
+Thanks for listening and happy hacking.
+You have been listening to Hacker Public Radio at Hacker Public Radio.
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