CONFIDENTIAL
DOC-USR-0026-02
___________________________________________________________________________________________
Z3 Technology, LLC
♦
100 N 8
th
ST, STE 250
♦
Lincoln, NE 68508-1369 USA
♦
+1.402.323.0702
30
5.12
Tuning for Latency
For latency, the key parameters to work with 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. However, a higher value also causes latency to increase accordingly. To minimize
latency, this value 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 the suggested values for Maximum Delay and Number of B-frames for three common 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.
5.13
Running DHCP
DHCP is also supported. When enabled, the Z3-DM816X-RPS RDK dynamically receives an IP address to use
at startup. The IP address that is assigned can be seen through the serial interface [
Note
: future releases
of the Z3-DM816X-RPS RDK will include a tool that can be run on the PC to detect any Z3 systems on the
network and what IP address they are assigned to]. To see how DHCP support works, you can do the
following steps:
(32)
First you need to set up a custom configuration to save the new setting to. 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
