MGW Ace Encoder HEVC Encoding and Streaming Appliance
User Manual, Version 2.1 32
Select the audio sampling rate (available for each of two audio tracks).
Select the embedded audio pair (available for each of two audio tracks).
Stream Profile
(HEVC only)
Select the Stream Profile to be used for the channel (refer to the Stream
Profiles (HEVC) section above for detailed information)
• Broadcast - Broadband
• ISR – Low Bandwidth
• Ultra Low Latency - LAN
• Manual
Select the box to enable video encoding.
Select the desired rate control mode as follows:
• CBR – constant bit rate. The specified value is used as the total. Audio
bit rate, streaming protocol overhead and Metadata bandwidth are
deducted from the specified value and the remaining bandwidth is
allocated towards the compressed video data.
• Capped VBR – variable bit rate with a cap. Average bitrate must be
set in the Total Bitrate field. The Max value is used to set a ceiling not
to be exceeded by the stream. Bandwidth utilization below the Max is
dynamically managed by the encoder based on the complexity of the
content, amount of motion and range of colors detected during the
session.
CBR is perfectly suited to ensure a constant bandwidth usage over a
transmission link. It is highly recommended to use it for
satellite/cellular/internet links or any other bandwidth constrained link which
requires a constant bitrate. It offers the best compromise of video quality and
latency for any video sequence.
If short bitrate peaks are allowed on a transmission link (such as LAN),
Capped VBR should be used as it offers better video encoding quality and
latency than CBR rate control while still providing a constant average bitrate.
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