Understanding Network Traffic For Ip Video; Impact Of Video Codec; Impact Of Resolution And Frame Rate - American Dynamics VideoEdge Design Manual

Understanding Network Traffic for IP Video

The overall network traffic for any IP video system begins with the edge devices (IP cameras and
encoders) and how they are configured by the NVR.

Impact of Video Codec

There are many different video codec, some are based on open standards while others are proprietary.
Each device may support one or more video codec. Selection of video codec will generally be dependent
on what the device and NVR supports, video usage, type of video, distance between device and NVR,
picture quality, plus available bandwidth and/or storage requirements. For Intra/Reference Frame
compression algorithms, when there is higher video activity, the resulting data rate will greatly increase
and in some cases be larger than MJPEG. The VideoEdge NVR currently supports the following codec:
Video
Definition
Codec
MJPEG Motion JPEG
Motion Pictures Expert Group
MPEG4
Part 2
ACC Active Content Compression

Impact of Resolution and Frame Rate

There are a wide variety of video resolutions available today. Each device will support a certain number of
resolutions and some are dependent on the video codec. Higher resolution will provide greater
Field-of-View that is captured by the video device. The VideoEdge NVMS currently supports up to three
resolutions for each supported device.
Frame rate options generally range between 1 and 30 frames-per-second (slightly less for PAL). Both
resolution and video codec directly impact device's maximum supported frame rate. Generally, higher
resolution settings will support lower frame rates as it requires more processing power to produce the
larger size images.
Selection of resolution and frame rate will generally be dependent of what the device and NVR supports,
video usage, type of video, plus available bandwidth and/or storage requirements. The VideoEdge NVR
currently supports up to three resolutions for each supported device and up to the maximum frame rate
that the device can produce based on the current network infrastructure.
Resolution
QCIF
CGA
CIF
2CIF
VGA
4CIF
1.3 MegaPixel (SXGA)
2.0 MegaPixel (UXGA)
3.0 MegaPixel (QXGA)
5.0 MegaPixel
11
Category
Standard
Standard
Proprietary (AD)
Width x Height Frame Rates
176x144 or 176x120 1-to-30
320x240 1-to-30
352x288 or 352x240 1-to-30
704x288 or 704x240 1-to-30
640x480 1-to-30
704x576 or 704x480 1-to-30
1280x1024 1-to-30*
1600x1200 1-to-24*
2048x1536 1-to-15*
2592x1944 1-to-9*
Compression Schema
Quality
Independent Frames
Intra/Reference Frames Moderate
Intra/Reference Frames
Supported by Video Codecs (Typical)
MJPEG MPEG4
MJPEG MPEG4
MJPEG MPEG4
MJPEG MPEG4
MJPEG MPEG4
MJPEG MPEG4
MJPEG MPEG4
MJPEG n/a
MJPEG n/a
MJPEG n/a
Video Maximum
Resolution
Mutli-MegaPixe
High
l
1.3 MP
Low 4CIF
Bandwidth &
Storage Usage
n/a
n/a
ACC
ACC
n/a Moderate
ACC Moderate
n/a
n/a
n/a
n/a
Bandwidth
& Storage
Usage
High
Moderate
Low
Low
Low
Low
Low
High
High
High
High