Audio Streaming

The system has built-in one- and two-way audio streaming support available in the Streamer Output and in the Remote Streamer entity.

  • In Streamer it is accessible under Output  Audio Streaming

  • In Remote Streamer it is accessible under Remote Streamer  Audio

Linux specifics

See Linux audio setup for instructions.
remote streamer audio
Figure 1. Overview of the audio settings.
Audio Processing
Enable

Enables the audio processing module.

Echo Cancellation

Sets the echo cancellation level: None, Low, Moderate (default), or High.

Noise Suppression

Sets the noise suppression level: None, Low (default), Moderate, High, or Very High.

Compression Gain

Sets the compression gain in decibels, range 0–90 dB.

The audio processing module requires the Send Period to be 480 frames.
Send
Use Default

Use the default audio recording device.

Device

The device to use for streaming audio.

Period

The number of audio samples to capture before sending. Valid values are 120, 240, 256, 480 (default), 512, 960, and 1024.

Mode

VBR (variable bitrate) or CBR (constant bitrate).

Target Bitrate

The desired bitrate in kbps, range 6–510 kbps, default 64 kbps.

Receive

The receiver always uses the default audio playback device.

Auto Start

Enable to automatically receive audio on project startup.

Reorder Buffer

Enable to use a buffer for incoming packets. Useful in situations where the network has packet reordering.

Reorder Packets

The maximum number of packets to keep in the reorder buffer. Default 5, range 0–4096.

Receive Buffer

The amount of time that the audio playback system is allowed to buffer, in milliseconds. Default 90 ms, range 5–2000 ms.

Max Invalid Packets In A Row

The number of invalid packets to receive before accepting them as valid. Default 200. Internally, a packet is invalid if it has an older timestamp than the previous packet. That can happen if the network has a lot of packet reordering, reorder buffer can help to mitigate this. It can also happen if the Streamer restarts, in that case, this setting determines how quickly new audio packets are accepted as valid.

If you experience choppy playback due to a jittery network, please try to first increase the receive buffer. Around 80 ms usually works fine on 4G networks. If that does not help, try activating the reorder buffer and experiment with the amount of reorder packets.