Optimizing Mpeg-2 Performance - VBrick Systems VB4000 Admin Manual

Table 2. IWS Configurable Options
Option
Network
Billboard
Decoder
Encoder
Pump
Recorder
FTP File Transfer
Conferencing
Passthrough
System
Video on Demand
Script Management

Optimizing MPEG-2 Performance

VBrick appliances are designed to accommodate a variety of configurations. Options such as
Hard Disk record and playback, and FTP file serving capability are fully meshed together,
supporting a diverse set of applications. VBrick unit's configuration choices enable the widest
range of features and capabilities and are designed to provide the user with a high degree of
flexibility. In some extreme cases, users can create configurations that exceed the normal
processing capacity of the unit causing it to not perform optimally. VBrick units provide
statistical counters and status variables indicating current device utilization and can even be
configured to report SNMP trap alarm conditions when these situations occur. Corrective
action usually involves the reduction of a video rate or disabling a channel, easily performed
via the IWS or CLI user interface. Under abnormal operating conditions, VBrick units
provide total system protection against any integral damage and guarantee management
connectivity via IWS or CLI.
In general, MPEG-2 video quality improves when video rate is increased. Significant video
quality improvements are noticeable when moving between 1.2 and 5 megabits per second
video rates. The video quality improvement becomes less noticeable when moving from
medium rates to higher video rates (from 5–9 Mbps.) with most of the improvement
occurring only during high motion video scenes. In essence, video quality is very subjective
and relates to other components such as the response of the human eye, the quality and
original content and signal, and the quality of the decoder and monitor. As a general rule, use
the lowest video rate that best suits the application.
6
Applicable Model
All VBrick models.
• Ethernet.
Only on models which have decoders.
Single or dual:
• Ethernet MPEG-2.
• Ethernet MPEG-4.
• SDI MPEG-2 (see SDI Configuration).
Single or dual:
• Ethernet MPEG-2.
• SDI MPEG-2 (see SDI Configuration).
VBStar models only (see VBStar).
VBStar models only (see VBStar).
VBStar models only (see VBStar).
Encoder and decoder combination models only.
All VBrick models.
All VBrick models.
Decoder models only.
All VBrick models.
© 2009 VBrick Systems, Inc.