CONFIDENTIAL
DOC-USR-0012-08
___________________________________________________________________________________________
Z3 Technology, LLC
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100 N 8
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ST, STE 250
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Lincoln, NE 68508-1369 USA
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+1.402.323.0702
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5.12 Tuning for Latency
The key parameters to work with for latency are Maximum Delay and Number of B-frames.
Maximum Delay defines the number of milliseconds of buffering the encoder has to work with. The
higher this value, the more buffering it has to work with and the more time it has to “smooth things
out” for challenging content. A higher value causes latency to increase accordingly. To minimize
latency, it should be set to the lowest possible value. The lowest value Z3 recommends is 100.
B-frames improve the quality of the picture, but they also increase the latency by 1 frame time. To
minimize latency, B-frames should be disabled (done by setting “Number of B-frames” to 1).
Figure 22 shows suggested values for Maximum Delay and Number of B-frames for 3 use cases:
Maximum Delay
# of B-frames
Case 1: Highest Quality, Highest Latency
9999
3
Case 2: Good Quality, Standard Latency
2000
2
Case 3: Normal Quality, Lowest Latency
100
1
Figure 22 Tuning for Various Use Cases
GDR can also be used to reduce latency if I-frames are not needed.
5.13 Running DHCP
DHCP is also supported. When enabled, the Z3-DM8107-RPS dynamically receives an IP address to use
at startup. The IP address that is assigned can be seen either through the serial interface or through
the ZFinder tool running on a PC. To see how DHCP support works, you can do the following steps:
(32)
The first step is to set up a custom configuration so that the DHCP setting is used the next time
the system boots up. To do this, click on the “User Presets” tab and click on “new”:
Figure 23 The User Presets Tab
(1) Click here to select “User Presets”
(2) Click here to set a new preset
