18
(d)
AUDIO
activation allows users to enable/disable the audio recording from the camera channels individually. This setting depends on the
utilised cameras having microphones.
(e)
LIVE
determines if a particular channel needs to be displayed or not. Such as, a particular camera will not be displayed but be recorded.
This allows for larger spaces to be allocated to the remaining cameras. There are two examples above in which 8 cameras are activated (
) and in which 2 camera channels (CH2 and CH4) have
LIVE
view turned
Off
Note: Displaying of the channels can be changed to optimise the space (CH1 camera has been enlarged since it gained the space left by
removing CH2 and CH4).
(f)
ENCODE
allows users to choose between Constant Bit Rate (
CBR
) and Variable Bit Rate (
VBR
). The difference is minimal as the Variable
Bit Rate is not efficient as it involves more processing power and may introduce some visible artefacts due to higher compression rates.
(g)
AUTOSCAN
activation and
AUTOSCAN DELAY
allows users to specify a periodic rotation in displaying the cameras in
LIVE
mode (i.e. the
ones that have
LIVE
set to
On
). The rotation will start from a split view with all cameras then switch to each camera channel every X
seconds (where X is specified in the
AUTOSCAN DELAY
box). This cycle skips cameras that have
LIVE
set to
Off
.
(h)
LIVE AUDIO
activation allows users to hear the audio coming from each camera every time a camera is selected manually (by selecting the
number key on the remote control) or when cycling (see
Note: A Brigade monitor with built-in audio functionality should be used.
4.1.4
Record Settings
(a) This section explains the process of selecting adequate image quality for individual camera channels.
the main window found by browsing to
Settings
Record
Record Settings.
This appears as a table with 4 (MDR-404xx-500) or 8
(MDR-408xx-1000) channels.
(b)
RES
allows users to choose the resolution for each channel. For MDR-404XX-500, the
maximum resolution can be achieved for all the 4 channels at maximum frame rate i.e. D1
@ 25fps (PAL) or D1 @ 30fps (NTSC) where D1 is 704x480 for PAL and is 704x576 for
NTSC.
(c) For MDR-408XX-1000, the frame rate has to be lowered to 12fps (PAL) and 15fps (NTSC)
for D1 resolution when used on more than 4 channels at the same time.
(d) In order to save storage space, HD1 and CIF options are available where HD1 is 704x240
for PAL, 704x288 for NTSC. CIF is 354x240 for PAL and 354x288 for NTSC. Both HD1 and
CIF are available at 25fps (PAL) and 30fps (NTSC) for the maximum number of channels.
(e)
FR
allows users to choose different frame rates for different channels depending on
RES
setting (
(f)
QUALITY
levels are used for Normal and Alarm recording. Level 1 is the best quality
whereas level 8 is the lowest quality. Brigade recommends using a higher quality for Alarms
for a higher level of image detail.
Note: Refer to Appendix 13.1 Video Quality Table for further details.
Record Settings Figure 30
4.1.5
Sub-Stream Settings
(a) This section elaborates on the sub-stream configuration which allows different quality levels for mirror (simultaneous) recording onto the SD
card.
(b) These settings also control the quality level for Live Video View via mobile network or Wi-Fi connection (depending on model). When using
3G or Wi-Fi, enable all sub-stream channels. Disabling these also disables this channel to be transmitted to the server.
(c) Mirror recording is used for recovery when the HDD recordings are inaccessible. This is due to the fact that SD cards have smaller storage
capacities when compared to HDDs.
(d)
illustrates the main window found by browsing to
Settings
Record
Sub-Stream.
(e)
ENABLE
this allows the users to choose which channels are being recorded onto the SD
card.
(f)
RES
is default set to CIF. Framerate can have different values depending on the number of
channels activated. Refer to Appendices 13.1 Video Quality Table for further details.
(g)
BANDWIDTH
can be set to be between 20Kbps and 4096Kbps. It determines the total size
of the recording for all active cameras. Refer to Appendices 13.1 Video Quality Table for
further details.
(h) For example, with a full bandwidth of 4096Kbps for recording 8 channels at CIF resolution
and 16fps, the total size for 1 hour of recording is approximately 1.8GB. The default settings
of 500Kbps has been chosen as a compromise between quality and space. This allows 1
hour of recording 8 channels at CIF resolution, 5fps and quality level 6 to occupy
approximately 220MB.
(i)
SUB MODE
can be adaptive or fixed. The recommended setting is adaptive which alters
the bitrate to optimise the memory required.
(j)
NET TRANS POLICY
is set by default to
PRIOR TRANS SPEED
which allows users to
dynamically change the bandwidth according to the image requirement to retain fluidity of
the image.
PRIOR IMG QUALITY
gives priority to the quality of the image rather than the
size of the sub-stream recording.
BALANCE
uses an optimum trade-off between recording
size and image quality.
Sub-Stream Settings Figure 31