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Airtime 2.5 for Broadcasters

Smartphone journalism

Using an ordinary smartphone and Airtime, you can upload your audio reports to the studio library or put them straight on the air. Here's how...

The basic voice recorder app on your phone may not have all the features you need for journalism, but there are plenty of more suitable recording apps available for both iPhone and Android. For instance, searching for 'ogg recorder' in the Play Store on an Android phone yields plenty of alternatives. The following example uses RecForge Lite because of its configurable recording formats. This free app is limited to three minutes per recording, but there is an unrestricted version available at very modest cost.

In the Settings window of the app, set the recording format as Ogg Vorbis, 44.1KHz sample rate, mono. Disable automatic gain control to get a consistent recording level, rather than artificially boosting quiet sounds, which should result in less distortion. Under 'Limit folders browsing' give the app access to all of the SD Card storage of the phone.

Back in the main recording window of RecForge, create a directory such as 'recordings' under the /mnt/sdcard/media/audio/ path, which is normally used by the phone's music application. You can then make recordings using the big red button, watching the input level meter to ensure a good signal to noise ratio. The recorded files are automatically named with date and time stamps, but can be renamed in the app later by selecting the Edit feature. The latest recordings are listed in the main recording window; individual files can be auditioned by tapping on them.

Open the web interface of your station's Airtime server in the phone's browser, log in with your username and password, and tap Add Media on Airtime's main menu. After tapping the Add Files button, the phone will offer a choice of file to upload. By tapping Select music track you can browse the /mnt/sdcard/media/audio/ directory on the SD card filesystem, without requiring the installation of a file manager app on the phone.

Tap one of the date-and-time-stamped files listed from the 'recordings' directory to select it, then tap the OK button. The files are credited to 'Unknown artist' because they have not yet been tagged with creator metadata.

After tapping the Start upload button on the Add Media page, the files are now copied into the remote Airtime library.

If you prefer, you can upload audio files to the organize folder on the Airtime server using an SFTP client, skipping the web browser step. See the chapter Manage media folders for details. Suitable client applications include AndFTP for Android:

You can now add the uploaded files directly to a forthcoming show, use them to create smart blocks or playlists in the Library, or edit their metadata to make them easier to find in searches later. One of the limitations of mobile recording is that it isn't always convenient to enter large amounts of text metadata when you're on the move. So a phone app that tagged audio recordings with creator, location and other relevant metadata would be very useful.

Going live

Mobile apps which enable you to stream directly into Airtime's live rebroadcast feature include KoalaSan for iOS: and BroadcastMySelf for Android: DemoIcesShout for Android also shows promise, although it can only stream a static file, rather than stream from a microphone:

A live workflow does of course depend on a steady network connection between the phone and Airtime server. Because streaming media on a regular basis can use a lot of bandwidth, it is advisable to use WiFi rather than mobile data (3G/4G) whenever possible, especially when roaming across networks.

KoalaSan can stream input from either the built-in microphone or the external jack of the iOS device. An example configuration for the Settings tab might be:

Name: Airtime
Port: 8003
Mountpoint: mastermount
Stream name: Airtime
Description: A live stream to Airtime
Genre: News
Username: masterstreamer
Password: masterpassword
Codec: mp3
Bitrate: 128
Protocol: Icecast2
Stereo: off
AudioBus: off
Dump: on
Broadcast: on

You can start streaming from the iOS device by tapping the start button in KoalaSan's Stream! tab.

To configure BroadcastMySelf, tap the gears icon in the top left corner to enter the settings page, then tap Output Settings. This action opens the Icecast Settings page, where example settings could be:






MP3 Encoder Bitrate
128 Kbit/s

Metadata Template

Streaming Buffer Size
MP3 buffer size X 8

You may also wish to configure the Tracks Folder setting, which enables you to stream static files from the storage of the device. Depending on where you keep your audio files, this could be a path such as:


To connect the Android device to the Airtime server, tap the square button in the lower middle of the main interface. The connection indicator on the button should turn blue, and the message connected should be shown. Push up the fader on the left to increase input level from the internal microphone, or push up the fader on the right and tap one of the named files in the upper right window to stream it. Tap either of the LOCK buttons to prevent the stream input level being changed accidentally.

When the connection is made, Airtime output will fade from scheduled play to the stream from your mobile device. See the chapter Stream settings for more details of connection preferences.

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