You can use the WowzaConfig class in the Wowza GoCoder™ SDK for iOS to configure properties for a live streaming broadcast. There are three primary categories of properties: video, audio, and connection properties for the Wowza Streaming Cloud™ service and Wowza Streaming Engine™ media server software.
Contents
Configure the stream Use the configuration presets
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Configure the stream
Configure the video
Use the following properties to configure the video stream:
| Property | Description |
| videoFrameSize | The video resolution (width by height) in pixels. The default is 640x480. |
| videoFrameRate | The number of frames per second (fps). The default is 30. |
| videoKeyFrameInterval | The number of frames between keyframe insertions. The default is 30. |
| videoBitrate | The video bitrate in bits per second (bps). The default is 1500. |
The following example demonstrates how to use the video properties:
// Get a copy of the active config WowzaConfig broadcastConfig = self.goCoder.config; // Set the frame rate to 15 fps broadcastConfig.videoFrameRate = 15; // Set the keyframe interval to 10 frames broadcastConfig.videoKeyFrameInterval = 10; // Set the bitrate to 2.5 kbps broadcastConfig.videoBitrate = 2500; // Update the active config self.goCoder.config = broadcastConfig;
Configure the audio
Use the following properties to configure the audio stream:
| Property | Description |
| audioSampleRate | The audio sample rate in hertz (Hz). The default is 44100. |
| audioChannels | The number of audio channels. The default is 2. |
| audioBitrate | The audio bitrate in bits per second (bps). The default is 64000. |
The following example shows how to use the audio properties:
// Get a copy of the active config WowzaConfig broadcastConfig = self.goCoder.config; // Set the sample rate to 22.1 kHz broadcastConfig.audioSampleRate = 22100; // Update the active config self.goCoder.config = broadcastConfig;
Configure the connection
Use the following properties to configure the connection to your Wowza Streaming Engine server or to a Wowza Streaming Cloud live stream:
| Property | Description |
| hostAddress | The domain name or IP address of the destination. There isn't a default value. |
| portNumber | The port number for the Wowza Streaming Engine server. The default is 1935. |
| applicationName | The name of the destination live streaming application. The default is live. |
| streamName | The name of the live stream that you're broadcasting. The default is myStream. |
| username | (If your application requires it) the source authentication username. There isn't a default value. |
| password | (If your application requires it) the password associated with the source authentication username. There isn't a default value. |
The following example shows how to use the connection properties:
// Get a copy of the active config WowzaConfig broadcastConfig = self.goCoder.config; // Set the hostname broadcastConfig.hostAddress = @"live.someserver.net"; // Set the name of the stream broadcastConfig.streamName = @"someStreamName"; // Update the active config self.goCoder.config = broadcastConfig;
Use configuration presets
Alternatively, configure your broadcast with one of the following presets, which accommodate common frame sizes:
| Preset | Frame Size | Bitrate |
| WOWZFrameSizePreset352x288 | 352x288 | 280 Kbps |
| WOWZFrameSizePreset640x480 | 640x480 | 1.5 Mbps |
| WOWZFrameSizePreset1280x720 | 1280x720, or 720p | 3.75 Mbps |
| WOWZFrameSizePreset1920x1080 | 1920x1080, or 1080p | 5 Mbps |
| WOWZFrameSizePreset3840x2160 | 3840x2160, or UHD 4K | 8 Mbps |
The following example shows how to use a frame-size preset:
// Get a copy of the active config WowzaConfig broadcastConfig = self.goCoder.config; // Set the defaults for 720p video [broadcastConfig loadPreset:WOWZFrameSizePreset1280x720]; // Update the active config self.goCoder.config = broadcastConfig;
