This manual is intended for administrators and users of the AXIS 212
PTZ Network Camera, and is applicable for software release 4.34 and
later. It includes instructions for using and managing the AXIS 212
PTZ on your network. Previous experience of networking will be of
use when using this product. Some knowledge of UNIX or
Linux-based systems may also be beneficial, for developing shell
scripts and applications. Later versions of this document will be
posted to the Axis Website, as required. See also the product’s online
help, available via the Web-based interface.
Safety Notices Used In This Manual
Caution! - Indicates a potential hazard that can damage the product.
Important! - Indicates a hazard that can seriously impair operation.
Do not proceed beyond any of the above notices until you have fully
understood the implications.
Intellectual Property Rights
Axis AB has intellectual property rights relating to technology
embodied in the product described in this document. In particular,
and without limitation, these intellectual property rights may include
one or more of the patents listed at http://www.axis.com/patent.htm
and one or more additional patents or pending patent applications in
the US and other countries.
This product contains licensed third-party software. For more
information, see the menu item “About” in the product’s user
interface or visit the AXIS 212 PTZ support pages at:
http://www.axis.com/techsup
This product contains source code copyright Apple Computer, Inc.,
under the terms of Apple Public Source License 2.0 (see
http://www.opensource.apple.com/apsl/).
The source code is available from:
http://developer.apple.com/darwin/projects/bonjour/
Legal Considerations
Video and audio surveillance can be prohibited by laws that vary
from country to country. Check the laws in your local region before
using this product for surveillance purposes.
This product includes one (1) MPEG-4 decoder license. To purchase
further licenses, contact your reseller.
Electromagnetic Compatibility (EMC)
This equipment generates, uses and can radiate radio frequency
energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference
will not occur in a particular installation.
If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the
equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures: Re-orient or
relocate the receiving antenna. Increase the separation between the
equipment and receiver. Connect the equipment to an outlet on a
different circuit to the receiver. Consult your dealer or an experienced
radio/TV technician for help. Shielded (STP) network cables must be
used with this unit to ensure compliance with EMC standards.
USA - This equipment has been tested and found to comply with the
limits for a Class B computing device pursuant to Subpart B of Part 15
of FCC rules, which are designed to provide reasonable protection
against such interference when operated in a commercial
environment. Operation of this equipment in a residential area is
likely to cause interference, in which case the user at his/her own
expense will be required to take whatever measures may be required
to correct the interference.
Canada - This Class B digital apparatus complies with Canadian
ICES-003.
AXIS COMMUNICATIONS
<Product Name> Quick User’s Guide
Europe - This digital equipment fulfills the requirements for
radiated emission according to limit B of EN55022/1998, and the
requirements for immunity according to EN55024/1998 residential,
commercial, and light industry.
Japan - This is a class B product based on the standard of the
Voluntary Control Council for Interference from Information
Technology Equipment (VCCI). If this is used near a radio or television
receiver in a domestic environment, it may cause radio interference.
Install and use the equipment according to the instruction manual.
Australia - This electronic device meets the requirements of the
Radio communications (Electromagnetic Compatibility) Standard
AS/NZS CISPR22:2002.
Equipment Modifications
This equipment must be installed and used in strict accordance with
the instructions given in the user documentation. This equipment
contains no user-serviceable components. Unauthorized equipment
changes or modifications will invalidate all applicable regulatory
certifications and approvals.
Liability
Every care has been taken in the preparation of this manual. Please
inform your local Axis office of any inaccuracies or omissions. Axis
Communications AB cannot be held responsible for any technical or
typographical errors and reserves the right to make changes to the
product and manuals without prior notice. Axis Communications AB
makes no warranty of any kind with regard to the material contained
within this document, including, but not limited to, the implied
warranties of merchantability and fitness for a particular purpose.
Axis Communications AB shall not be liable nor responsible for
incidental or consequential damages in connection with the
furnishing, performance or use of this material.
Trademark Acknowledgments
Apple, Boa, Bonjour, Ethernet, Internet Explorer, Linux, Microsoft,
Mozilla, Netscape Navigator, OS/2, Real, QuickTime, UNIX, Windows,
WWW are registered trademarks of the respective holders. Java and
all Java-based trademarks and logos are trademarks or registered
trademarks of Sun Microsystems, Inc. in the United States and other
countries. Axis Communications AB is independent of Sun
Microsystems Inc.
UPnPTM is a certification mark of the UPnPTM Implementers
Corporation.
This product
includes MPEG-4
AAC audio coding
technology licensed
by Fraunhofer IIS.
Refer to FHG audio
home page
http://www.iis.fraunhofer.de/amm/
Support
Should you require any technical assistance, please contact your Axis
reseller. If your questions cannot be answered immediately, your
reseller will forward your queries through the appropriate channels to
ensure a rapid response. If you are connected to the Internet, you can:
• download user documentation and firmware updates
• find answers to resolved problems in the FAQ database. Search by
product, category, or phrases
• report problems to Axis support by logging in to your private
support area
• visit Axis Support at www.axis.com/techsup/
Safety Notice - Battery Replacement
The AXIS 212 PTZ uses a 3.0V CR2032 Lithium battery as the power
supply for its internal real-time clock (RTC). Under normal conditions
this battery will last for a minimum of 5 years. Low battery power
affects the operation of the RTC, causing it to reset at every power-up.
A log message will appear when the battery needs replacing.
The battery should not be replaced unless required!
If the battery does need replacing, please observe the following:
• Danger of Explosion if battery is incorrectly replaced
• Replace only with the same or equivalent battery, as recommended
by the manufacturer.
• Dispose of used batteries according to the manufacturer's
instructions.
WEEE Directive
The European Union has enacted a Directive 2002/96/EC on
Waste Electrical and Electronic Equipment (WEEE Directive).
This directive is applicable in the European Union member
states.
The WEEE marking on this product (see right) or its
documentation indicates that the product must not be disposed of
together with household waste. To prevent possible harm to human
health and/or the environment, the product must be disposed of in an
approved and environmentally safe recycling process. For further
information on how to dispose of this product correctly, contact the
product supplier, or the local authority responsible for waste disposal
in your area.
Business users should contact the product supplier for information on
how to dispose of this product correctly. This product should not be
mixed with other commercial waste.
AXIS 212 PTZ Network Camera is ideal for surveillance and remote monitoring, offering overview images and
instant one-click pan/tilt/zoom control. It combines a 3 Megapixel sensor with a wide-angle lens, providing
VGA resolution. Without any moving parts, this camera offers guard tour functionality without wear and tear.
Built-in Power over Ethernet support implies reduced cabling and installation costs as well as consolidated
power for higher reliability. Simultaneous Motion JPEG and MPEG-4 video streams, a comprehensive set of
network security features and two-way audio support increase the surveillance and monitoring options.
For indoor use only
• Instant one-click Pan, Tilt and Zoom
• PTZ with no moving parts - no wear and tear
• Simultaneous MPEG-4 and Motion JPEG for optimized quality and bandwidth
• Power over Ethernet for reduced cabling and consolidated power
• Two-way audio, including built-in microphone and detection alarm
• 140º pan and 105º tilt
• Pan & Tilt speed 400º/1 sec.
• 3 times instant zoom
• Tamper proof mounting
5
Key features
Overview
AXIS 212 PTZ - Product Features
Camera unit
Status
indicator
(LED)
Cover
plate
Audio out
Audio in
Dome casing
Microphone
Control
Power
indicator
(LED)
button
Network
indicator
(LED)
Power
connector
Serial number (S/N)
The serial number is required
during the installation.
Please make a note of the
serial number and retain
for future reference.
I/O terminal
connector
Network
connector
Power Connector - For connection of the PS-H power adapter (included).
I/O Connector - The I/O terminal connector provides the physical interface to one transistor output, one digital
input and an auxiliary connection point for DC power. For more information, see
The I/O Terminal Connector,
on page 33.
Network Connector - The camera connects to the network via a standard network connector. Supporting
NWAY, the camera detects the speed of the local network segment (10BaseT/100BaseTX Ethernet). Supporting
PoE (Power over Ethernet), the camera can be powered directly from the network cabling.
Audio out- Audio output (line level), which can be connected to a public address (PA) system or an active
speaker with a built-in amplifier. A pair of headphones can also be attached. A stereo connector must be used
for the audio out.
Audio in - One 3.5mm input for a mono microphone, or for line-in mono signal (left channel is used from a
stereo signal).
Microphone - Built-in microphone.
To prevent unauthorized listening, the internal microphone can be disabled by inserting a plug in the 'Audio in'
connector.
Serial Number Label - The serial number may be required during installation.
Control Button - Press this button to install the camera using the AXIS Internet Dynamic DNS Service, or to
restore the factory default settings, as described in
Resetting to the Factory Default Settings, on page 32.
6
AXIS 212 PTZ - Product Features
I/O terminal connector - Pinout
Pin Function Description
4Transistor Out-
put
3Digital InputConnect to GND to activate, or leave floating (or unconnected) to deactivate.
23.3V DCCan be used to power auxiliary equipment, max 50mA.
1GND
With a maximum load of 50mA and a maximum voltage of 24V DC, this output has an open-collector NPN transistor with the
emitter connected to the GND pin. If used with an external relay, a diode must be connected in parallel with the load, for pro
tection against voltage transients.
LED indicators
LEDColorDescription
NetworkGreenSteady for connection to 100 Mbit/s network. Flashes for network activity.
AmberSteady for connection to 10 Mbit/s network. Flashes for network activity.
UnlitNo connection.
StatusGreenShows steady green for normal operation.
Note: The Status LED can be configured to be unlit during normal operation, or to flash only when the camera is accessed. See the
online help files for more information. Go to Setup > System Options > LED settings
AmberSteady during startup, reset to factory default or when restoring settings.
RedSlow flash for failed upgrade.
PowerGreenNormal operation.
AmberFlashes green/amber during firmware upgrade.
-
Network
connector
up
Note: The AXIS 212 PTZ must be mounted with the network connector facing upwards to achieve the correct image orientation.
7
AXIS 212 PTZ - Accessing the Camera
Accessing the Camera
To install the camera on the network, please see the installation guide supplied with your product. The camera
can be used with most standard operating systems and browsers. The recommended browser is Microsoft
Internet Explorer with Windows, Safari with Macintosh and Mozilla with other operating systems.
Notes: • To view streaming video in Microsoft Internet Explorer, set your browser to allow ActiveX controls and allow the AXIS Media Control
(AMC) to be installed on your workstation.
• QuickTime
• If your workstation restricts the use of additional software components, the camera can be configured to use a Java applet for viewing
motion JPEG.
• The AXIS 212 PTZ includes one (1) decoder license for viewing MPEG-4 video streams. This is automatically installed with AMC. The
administrator can disable the installation of the MPEG-4 decoder, to prevent unlicensed copies being installed.
Access from a browser
1. Start a browser (e.g. Internet Explorer, Mozilla).
2. Enter the IP address or host name of the camera in the
Location/Address field of your browser.
To access the camera from a Macintosh computer (Mac OSX), simply click on the Bonjour tab and select
the AXIS 212 PTZ from the drop-down list.
TM
and Real PlayerTM are also supported for viewing streaming MPEG-4 video and audio.
3. If this is the first time the camera is accessed, see Setting the Password, on page 8. Otherwise enter
your user name and password, as set by the administrator.
4. The camera’s Live View page is now displayed in your
browser.
Note:
The layout of the Live View page may have been customized to specific
requirements. Consequently, some of the examples and functions featured
here may differ from those displayed on your own Live View page.
Setting the Password
1. When accessing the camera for the first time, the
‘Configure Root Password’ dialog will be displayed on
the screen.
2. Enter a password and then re-enter it, to confirm the spelling. Click OK.
3. The ‘Enter Network Password’ dialog will appear. Enter the User name: root Note: The default administrator user name root is permanent and cannot be deleted.
4. Enter the password as set in step 2 above, and click OK. If the password is lost, the camera must be
reset to the factory default settings. See page 32.
5. If required, click Yes to install the AXIS Media Control (AMC). You will need administrator rights on
the computer to do this.
8
AXIS 212 PTZ - Accessing the Camera
AXIS Media Control
The AXIS Media Control (AMC) is installed automatically the first time the camera is accessed from Microsoft
Internet Explorer. The AMC control panel can be opened by right-clicking on the video image in the Live View
web page. The AMC control panel can be used to configure various video and audio settings. Please see the
readme file included in the tool for more information.
Accessing the camera from the Internet
Once installed, the camera is accessible on your local network (LAN). To access the camera from the Internet you
must configure your broadband router to allow incoming data traffic to the camera. One way to do this is to
enable the NAT-traversal feature, which will attempt to automatically configure the router to allow access to the
camera. This is enabled from Setup > System Options > Network > TCP/IP Advanced.
For more information, please see NAT traversal (port mapping), on page 28. See also the AXIS Internet Dynamic
DNS Service at www.axiscam.net or, for Technical notes on this and other topics, visit the Axis Support Web at
www.axis.com/techsup
The Live View Page
Depending on whether or not the Live View page has been customized, the buttons described below may or may
not be visible.
The Video Format drop-down list allows the video format on the Live View page to be
temporarily changed.
The Output buttons control the
output directly from the Live View page. These buttons are
configured under Setup > Live View Config > Layout.
The Action buttons can trigger an event directly from the Live View page. These are configured
under Setup > Live View Config > Layout.
The Snapshot button saves a snapshot of the video image currently being displayed. Right-click on
the video image to save it in JPEG format on your computer. This button is primarily intended for
use when the AMC viewer toolbar is not available.
The AMC viewer toolbar (AXIS Media Control) is available in Microsoft Internet Explorer only. It displays the
following buttons:
The Play/Stop button starts and stops the live video stream.
Pulse - click this button to activate the
output for a defined period of time, e.g.
to switch on a light for 20 seconds.
Active/Inactive - click these buttons to
manually start and stop a connected
device, e.g. switch a light on/off.
The Snapshot button saves a snapshot of the video image currently being displayed. The Snapshot
function and the target directory for saving snapshots can be configured from the AMC Control Applet
in the Windows Control Panel (Internet Explorer only).
Click the View Full Screen button to make the video image fill the entire screen area. No other windows
will be visible. Press Esc (Escape) on the computer keyboard to exit full screen.
Note: The snapshot function in MPEG-4, Full Screen Mode will revert the image view to the default live view page. Click the View Full
Screen button to return to Full Screen Mode.
9
AXIS 212 PTZ - Accessing the Camera
Pan/Tilt/Zoom controls
The Live View page also displays the Pan/Tilt/Zoom controls.
These are enabled/disabled for specified users by the administrator under System Options > Security > Users > User List.
The Pan, Tilt and Zoom bars control their respective functions in two different ways. Clicking
anywhere on the bar's gradient allows for a 'smooth' adjustment of the camera's position, whilst
clicking on the arrows at the two ends of the bar cause a stepped, incremental change.
Zoom out to overview image will set the camera to the minimum zoom position. Note that when
in this position, the camera cannot pan or tilt.
The control panel
The AXIS 212 PTZ can be controlled using one-click PTZ, click-in-image movement.
Click the Ctrl panel button to display the control panel, where the following selections
are available:
• Navigation mode: Center will instantly move the camera view to center on the
position that was clicked.
Joystick moves the camera in the direction indicated by a mouse click, relative
to the center of the image. The further from the center the image is clicked, the
greater the movement.
•If in Center mode, select whether the camera should pan, tilt or zoom to the position in the image that
was clicked.
Note: The scroll wheel on the mouse can also be used to control the zoom.
AMC audio controls
The AXIS 212 PTZ can transmit audio to clients using either the built-in microphone or a connected external
microphone and can play audio received from clients via a connected speaker. There are audio controls for
controlling the microphone and the client computer’s speaker output. These controls are only available when
audio is enabled, see
Click the Speaker and Microphone buttons to switch the sound off and on for the speaker and
microphone, respectively.
When using Half-duplex mode, this button toggles between allowing you to speak and listen. The first
icon indicates that you can talk and the speaker connected to the camera will play your voice. The
second indicates that you will hear audio from the camera.
Simplex - Network Camera speaker only - the speaker connected to the AXIS 212 PTZ will play audio
transmitted from any web client. This mode requires you to use the push to talk button.
AXIS Media Control, on page 9 and Audio, on page 16.
Use the sliders to control the volume on the speaker and microphone. The volume can be set
between 0 and 100.
Simplex - Network Camera microphone only - transmits audio from the AXIS 212 PTZ to any web clients.
This can be used in remote monitoring, web attractions etc., to provide live audio from a monitored situation.
Note: External microphone and speaker are optional and not included.
10
AXIS 212 PTZ - Video Streams
Video Streams
The AXIS 212 PTZ provides several different image and video stream formats. The type to use depends on your
requirements and on the properties of your network.
The Live View page in the AXIS 212 PTZ provides access to MPEG-4 and Motion JPEG video streams, as well as
to single JPEG images. Other applications and clients can also access these video streams/images directly,
without going via the Live View page.
How to stream MPEG-4
This video compression standard makes good use of bandwidth, and can provide DVD-quality video streams at
less than 1 Mbit/s. Note that the image settings of the MPEG-4 stream are the same for all clients.
Deciding on the combination of protocols and methods to use depends on your viewing requirements, and on
the properties of your network. The available options in AMC are:
Unicast RTPThis unicast method (RTP over UDP) should be your first consideration for
RTP over RTSPThis unicast method (RTP tunneled over RTSP) is useful as it is relatively
RTP over RTSP over HTTPThis unicast method can be used to traverse firewalls. Firewalls are
Multicast RTPThis method (RTP over TCP) should be your first consideration for live
live video, especially when it is important to always have an up-to-date
video stream, even if some images are dropped.
simple to configure firewalls to allow RTSP traffic.
commonly configured to allow the HTTP protocol, thus allowing RTP to
be tunneled.
video, especially when it is important to always have an up-to-date
video stream, even if some images are dropped.
Unicasting is used for video-on-demand broadcasting, so
that there is no video traffic on the network until a client
connects and requests the stream.
Note: There is a maximum of 20 simultaneous viewers.
Multicasting provides the most efficient usage of
bandwidth, especially when there are large numbers of
clients viewing simultaneously. Note however, that a
multicast broadcast cannot pass a network router unless
the router is configured to allow this. It is thus not
possible to multicast over e.g. the Internet.
AMC will negotiate with the camera to determine exactly which transport protocol to use in the order listed
above. This order can be changed and the options disabled, to suit any specific requirements. Right-click the
video image and select Settings from the menu to access the AMC menu.
Important!
MPEG-4 is licensed technology. The AXIS 212 PTZ includes one viewing client license. Installing
additional unlicensed copies of the viewing client is prohibited. To purchase additional licenses, contact
your Axis reseller.
11
AXIS 212 PTZ - Video Streams
MPEG-4 clients
AXIS Media Control (AMC)
The recommended method of accessing live video (MPEG-4 and Motion
JPEG) from the AXIS 212 PTZ is to use the AXIS Media Control (AMC)
in Microsoft Internet Explorer in Windows.
The AMC control panel can be used to configure various video and
audio settings. Please see the readme file included in the tool for more
information.
The AMC control panel is automatically installed on first use, after
which it can be configured.
Open the AMC Control Panel from:
• Windows Control Panel (from the Start menu)
• Alternatively, right-click the video image in Internet Explorer and
click Settings in the menu.
QuickTime™ & Real Player™
To access the video stream from e.g. QuickTime™ or Real Player™ the following paths can be used:
• rtsp://<ip>/mpeg4/media.amp
• rtsp://<ip>/mpeg4/media.3gp
Notes: • The AXIS 212 PTZ supports QuickTime 6.5.1 (or later) and Real Player 10.5 (or later)
• QuickTime adds latency to the video and audio stream (up to 3 seconds)
• It may be possible to use other players to view the MPEG-4 stream using the paths above, although this is not guaranteed by Axis
• <ip> = IP address
Motion JPEG
This format uses standard JPEG still images for the video stream. These images are then displayed and updated
at a rate sufficient to create a stream that shows constantly updated motion.
The Motion JPEG stream uses considerable amounts of bandwidth, but provides excellent image quality and
access to each and every individual image contained in the stream. The recommended method of accessing
Motion JPEG live video from the AXIS 212 PTZ is to use the AXIS Media Control (AMC) in Microsoft Internet
Explorer in Windows.
Note also that multiple clients accessing Motion JPEG streams can use different image settings.
Alternative methods of accessing the video stream
Video/images from the AXIS 212 PTZ can also be accessed in the following ways:
• Motion JPEG server push (if supported by the client, e.g. Mozilla/Firefox/Safari 2.0 and later). This option
maintains an open HTTP connection to the browser and sends data as and when required, for as long as
required. See
• Still JPEG images in a browser. Enter e.g. the path: http://<ip>/axis-cgi/jpg/image.cgi?resolution=320x240
• Windows Media Player. This requires AMC and the MPEG-4 viewing client to be installed. The paths that can
be used are listed below in the order of preference.
• Unicast via RTP: axrtpu://<ip>/mpeg4/media.amp
• Unicast via RTSP: axrtsp://<ip>/mpeg4/media.amp
• Unicast via RTSP, tunneled via HTTP: axrtsphttp://<ip>/mpeg4/media.amp
• Multicast: axrtpm://<ip>/mpeg4/media.amp
HTML Examples, on page 20.
12
AXIS 212 PTZ - Configuration
Configuration
This section describes how to configure the camera, and is intended for product Administrators, who have
unrestricted access to all the Setup tools, and Operators, who have access to the settings for Video & Image,
Audio, Live View Config and Event Configuration.
The camera is configured from Setup, from a standard browser (see Minimum web browsing requirements, on
page 39).
The descriptions below show examples of the features available in the AXIS 212 PTZ. For details of each setting,
please refer to the online help available from the setup tools. Click
Accessing the Setup tools
Follow the instructions below to access the Setup Tools from a browser.
1. Start your browser and enter the IP address or host name of the camera in the location/address field.
2. The Live View page is now displayed. Click Setup to display the Setup tools.
to access the online help.
Setup tools
13
Video and Image settings
AXIS 212 PTZ - Configuration
Image Appearance
Use these settings to change the image as required. The video image can be fine-tuned by adjusting the color
level, the brightness and the sharpness.
The configuration of the video image will affect the camera’s overall performance, depending on how it is used
and on the available bandwidth. Setting higher resolution and lower compression improves video image quality,
but increases the amount of bandwidth used. Please see the online help for further information on these settings.
Text Overlay Settings
Use these settings to include a text, date and time overlay. The
text, date and time overlay is included on one line at the top
or bottom of the video image.
Video Stream
Define the maximum video stream time per session in
seconds, minutes or hours. When the set time has expired, a
new stream can be started by refreshing the page in the
browser. For unlimited video stream time, select the
Unlimited radio button. Note that the maximum video stream
time does not apply to clients connecting via multicast.
The frame rate allowed to each viewer can also be limited, to reduce bandwidth usage. To allow the highest
available frame rate, select the Unlimited radio button.
Text, date and
time overlay
For a preview of the image before saving, click Test. When satisfied with the settings, click Save. Please note
that the preview image will be in JPEG format, even though the settings are valid both for Motion JPEG and
MPEG-4.
14
AXIS 212 PTZ - Configuration
Overlay Image Settings
Use image as overlay is a text and/or a static image superimposed over the video image.
Advanced - Camera Settings
These pages include different settings for fine-tuning the video image.
To compensate for the lighting conditions, the white balance and exposure control can be adjusted.
Low Light Behavior
Exposure priority defines the balance between image quality and the frame rate. Higher image quality may
reduce frame rate and increase motion blur. A prioritized frame rate may instead increased image noise.
Depending on requirements, use this to give higher priority to the image quality or to the frame rate.
Please refer to the online help for more information .
Advanced - MPEG-4 Settings
GOV Settings
The GOV structure describes the composition of the MPEG-4 video stream. Setting the GOV-length to a high
value saves considerably on bandwidth. The Cyclic refresh parameter gives a smoother bit rate and can be
useful if bandwidth is limited.
Bit Rate Control
Limiting the maximum bit rate is a good way of controlling the bandwidth used by the MPEG-4 video stream.
Leaving the Maximum bit rate as unlimited will provide consistently good image quality, but at the expense of
increased bandwith usage whenever there is more activity in the image. Limiting the bit rate to a defined value
will prevent excessive bandwidth usage, but images will be lost when the limit is exceeded.
Note that a maximum bit rate can be used for both variable and constant bit rates.
The bit rate type can be set as Variable Bit Rate (VBR) or Constant Bit Rate (CBR). VBR will adjust the bit rate
according to the images' complexity, thus using a lot of bandwidth for a lot of activity in the image and less for
lower activity in the monitored area.
CBR allows you to set a fixed Target bit rate that will consume a predictable amount of bandwidth, and which
will not change whatever happens in the image.
As the bit rate would usually need to increase for increased image activity, but in this case cannot, the frame
rate and image quality will be affected negatively. To go some of the way towards compensating for this, it is
possible to prioritize either the frame rate or the image quality whenever the bit rate would normally need to be
increased. Not setting a priority means the frame rate and image quality will be affected approximately equally.
15
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