VBrick Systems 7000 - Manual (Page 39)

Video/Audio Configuration
VBrick H.264 Appliance Admin Guide 33
† Based on Video Format and Video Aspect Ratio.
† † Default template.
Template This read-only field shows the template (if any) that is currently
applied. If a template is applied, it will display
Parameters Match or
Parameters Do Not Match (depending on whether or not changes have
been made).
Profile Each profile targets a specific class of applications. The profile you
select must be supported by the decoder. For example, StreamPlayer
and QuickTime support both profiles.
• Baseline – Typically used for applications with limited computing
resources, for example video conferencing and mobile
applications. Maximum backwards compatibility and lower CPU
requirements for decoder.
• Main – Default. Originally intended for broadcast and storage
applications providing better quality and more efficient
bandwidth usage.
Resolution Sets the video encoding resolution (the width and height respectively
of the video on a PC screen. See Table 5 below for all resolutions.
Target Bit Rate
(bits/sec) 32,000– 10,000,000 bits/sec. Constant bit rate. Default = 750,000.
This number, in 1000 bits/sec increments, represents how much data
the VBrick will send out each second to carry video to a player. The
word target is used because the appliance can vary its bit rate slightly
in response to the amount of detail in the movie or camera output.
The more data the appliance sends in one second, the more clearly
the details of the video will be seen on a player. It is not always
desirable to send the most possible data, since that requires a large
network "pipe" (connection). The trade-off is the level of detail in the
video with the use of smaller network connections. The encoder tries
to encode the video at a quality that will (on average) match the
Target Bit Rate. The larger the number, the better the quality but this can
potentially limit the number of clients that can connect to the encoder.
Target Frame Rate
(frames/sec) • NTSC: 30, 15, 10, 7.5, 6, 5, 3, 2, 1, 0.5. Default = 30.
• PAL: 25, 12.5, 5, 2.5, 1, 0.5. Default = 25.
This number represents how many frames the VBrick will send out
each second to carry the video to an H.264 player. The word target is
used because the VBrick can vary its frame rate slightly in response to
the amount of motion in the movie or camera output. See the Rate
Control Setting parameter below for more details.
Frame rate is the number of "frames" the VBrick sends in a second
for an H.264 player to display. Moving pictures are made up of a
rapid series of "still" pictures that move so fast that the "illusion" of
motion is produced. A frame is one such "still" picture. Regular TV
programs in the U.S. run at about 30 frames in a second; and the
more frames presented in a second; the smoother the motion
contained within the video will appear. Encoding and transmitting a
frame requires the use of data, so that, when considering a particular
bit rate, sending more frames demands that each frame contain fewer
fine details.