CONFIDENTIAL
Z3-DM8169-APP-L1-RPS V2.01.10
___________________________________________________________________________________________
Z3 Technology, LLC
♦
100 N 8
th
ST, STE 250
♦
Lincoln, NE 68508-1369 USA
♦
+1.402.323.0702
20
5.10 Tuning for Latency
For latency, the key parameters to work with are TS Lowlat Mode, Maximum Delay and Number of B-
frames.
TS Lowlat Mode causes the TS muxer to operate in low latency mode.
Maximum Delay defines the number of milliseconds of buffering the encoder has to work with. The higher
this value, the more buffers 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 50.
B-frames improve the quality of the picture, but they also increase the latency by one frame time. To
minimize latency, B-frames should be disabled (done by setting “Number of B-frames” to 1).
Figure 11 shows the suggested values for TS Lowlat Mode, Maximum Delay and Number of B-frames for
three common use cases:
TS
Lowlat
Maximum
Delay
# of B-frames
Case 1: Highest Quality, Highest Latency
0
9999
3
Case 2: Good Quality, Standard Latency
0
2000
2
Case 3: Normal Quality, Lowest Latency
1
50
1
Figure 11 Tuning for Various Use Cases
