Operation Manual

GoStream Series User Guide
ViewCast 95
Audio tab
Use the following table to configure the audio analog input settings for an MPEG4 encoder.
Note: The choices in the drop-down list may vary.
Figure 117. Audio tab
To configure audio settings:
1.
In the Source field, select an audio source from the drop-down list.
2.
Select the Overlay Closed Caption check box to enable overlay closed captions. Field 1 CC 1 is
the default setting.
3.
Click the Audio Format.
4.
Click the Audio Type. The drop-down list box provides two choices:
 Main – The same as Low Complexity, but adds backward prediction.
 Low Complexity – The simplest and most widely used and supports AAC audio format.
 HE-AAC VI – Uses spectral band replication (SBR) to enhance the compression efficiency in
the frequency domain.
 HE-AAC V2 – Enhances the compression efficiency of stereo signals.
Note: Depending on the player on which the resulting stream will be heard, either choice will
use a specific set of tools to encode the audio stream. Make your choice based on the
requirement of the playback software or device. The most widely supported format is the
Low Complexity profile.
5.
The default Audio Encoder is AAC (Advanced Audio Coding) – a standardized, lossy
compression and encoding scheme for digital audio. AAC achieves better audio quality than
MP3. AAC and MP3 are MPEG standards.
6.
Click the Bitrate.
7.
Drag the sliders to adjust the Left Volume and Right Volume.
8.
(Optional) Select Mute Audio to silence audio.
9.
Click Save Settings.