Haivision Kraken User Manual page 60

Advanced Setting
Depth of Network
Shaping Buffer
Recommended Start Settings for Advanced Shaping Settings
Following are the recommended start settings when using the Advanced Shaping settings:
Shaping Video Max Bitrate
Shaping Target Bitrate
VBV Size
Network Shaping Buffer
The goal should be to try and maximize the channel utilization (and thus the quality) while
minimizing the shaping buffer overruns and minimizing the latency. Starting with the
above values, you may try the following:
● Increase the bitrate percentages to improve quality.
● Increase the VBV and network shaping size to decrease bitstream drop based on
shaping buffer overrun.
Kraken User's Guide, v2.6, Issue 02
Managing Kraken from the Web Interface
Description/Values (Cont.)
This is the depth of the CBR buffer in the decoder
TIP:
VBV model in milliseconds.
A value that you should strive for is 1000ms; lower
values may decrease the rate at which the encoder
overruns the network buffers at lower bitrates.
Increasing this parameter increases latency and also
increases quality. It should not be lowered below
1000ms. A good quality encoder will make intra frames
12- 15 times larger than non-intra frames. At 30fps, this
means half of the stream bitrate is consumed for a
single video frame. Since it must fit inside the VBV, the
optimal point for our low delay application is 1000ms.
Type in or adjust the slider to specify the value in
milliseconds for the network shaping buffer depth.
500 - 3000ms
Range =
This is the depth in milliseconds of the network
NOTE:
traffic shaper's buffers. Since a good quality encoder
will generate an intra frame consuming approximately
50% of the available bitrate in one frame, this is the
interval over which the bitrate spike of the intra frame is
sent out over the network to keep it inside the channel
bitrate. If the encoder overshoots this buffer, because
the bitrate is too low for the resolution, frame rate,
and/or scene complexity, the encoder will overrun this
buffer. As a result, a decoder will receive a corrupt
stream.
100%
70%
1000ms
1000ms
Configuring Transcoders
60