MGW Ace Encoder HEVC Encoding and Streaming Appliance
User Manual, Version 2.1 43
Error Correction Settings
Zixi™
The Zixi protocol supports two modes: Zixi Broadcaster Server and Point-to-point streaming
directly from the VITEC encoder to the VITEC decoder appliance. Zixi sessions can be protected by
a password. Protected sessions ensure that only authorized encoders/decoders participate in these
sessions.
• Password: If a password was set on Zixi™ server, enter the password for streaming. If
no password was set on the Zixi™ server, no password is required. When connecting
directly (point-to-point) to a decoder, a password is not applicable.
• Latency: Enter a latency value in milliseconds to be used for correcting errors. The
minimal latency to be used must be higher than 3 times the RTT value (Round Trip Time)
between the encoder and the targeted decoder. RTT value is available in Zixi Channel
Statistics window after the Zixi channel has been started. Additionally, higher latency
increases tolerance to network errors (range 0-6000 milliseconds). The actual error
correction rates depend also on the stream bit-rate. On average, 500ms latency yields
protection of up to 6% of network errors. 6000ms latency yields protection of up to 30%
of network errors.
• When using a Zixi latency lower than 500ms, FEC data protection is enabled resulting in an increased total output
bitrate up to 50%. Ensure the transmission link bandwidth is dimensioned for such bitrate.
• If Zixi latency is set to 0, no data protection is achieved. Use this value to analyze the quality of your transmission
link. Transmission link statistics are reported within the Zixi Statistics Channel (Dashboard).
Check the Zixi Statistic information window to monitor the packet loss of the transmission
link used and set the latency accordingly.
• Enable ABR (Adaptive Bitrate): Select the check box to allow either VITEC decoder or
Broadcaster Server to automatically change the encoding bit-rate while streaming. When
selected, the channel total bit-rate will automatically be optimized, based on network
performance and statistics from the Zixi stream recipient, to ensure smooth, artifacts-free
playback.
• Minimum Bit-Rate: Set the minimum bit-rate allowed while in dynamic mode
• Maximum Bit-Rate: Set the maximum bit-rate allowed while in dynamic mode.
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