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DVR Guide - DMR4-MPEG4
The DMR4 digital video recorder has been updated to include
many features that are found only in more expensive models.
Based on MPEG4 compression this DVR provides high recording
resolution, fast frame rates, LAN connection and full triplex operation.
Image Sampling and Recording Rates
Utilising the MPEG4 algorithm high-quality images are
recorded with small file sizes . This allows longer recording capacity per hard disk.
Recording rates of up to 100 frames per second are
available shared across all channels. This means you can record in real time
(25fps) on 4 channels. The resolution of each camera image at this recording
rate will be 352 x 240 pixels. This is termed CIF resolution.
Unlike some recorders that only allow quad playback at
100fps the DMR4 images can be played back as an individual channel.
The DMR4-MPEG recorder has one of the highest recording
resolutions of 720 x 576 pixels. At this resolution the maximum recording rate
is 25fps, shared across all channels.
This makes the DMR4-MPEG4 recorder suitable for a very wide
range of applications. Whilst it may seem beneficial to record at the highest
possible rates bear in mind you will fill the hard drive quicker.
As a guide line here are recommended recording rates for
each camera for typical applications.
| Application |
Typical Recording Rates (Frames per Sec) |
| Car Parking, external people movement |
0.5-2fps |
| Office, shop |
2fps |
| Money counting |
3.5-7.5fps |
| Traffic monitoring |
5-25fps |
When comparing with the specifications of other DVRs make sure
the recording rates are not quoted in fields per second. (1 frame = 2 fields)
Recording Modes
Image quality settings can be chosen from Best, High,
Normal and Basic.
Recording modes are Manual, Timer, Motion, Alarm or Remote.
Timer mode allows the user to select start and end times of
recording.
Motion detection recording is provided by utilising a 16 x
12 grid to set or blank out areas of unwanted movement. The sensitivity of
detection can be varied and the number of squares of the grid to be activated
can be user defined. This gives one of the most comprehensive motion detection
settings allowing wind blown trees or small objects like animals to be ignored,
hence, reducing false activations.
Alarm recording allows triggering from an external source.
Remote recording allows the user to control the recording from a
remote location by connecting to the recorder over a network or broadband
connection. This feature is often only found on more expensive recorders.
Pre-alarm recording is available with a buffer size of 8MB.
This works by the unit continuously recording but only saving the
information if the alarm or motion detection is triggered.
Recording times are dependant on the HDD size and frame
rate/quality settings.
The DMR4-MPEG4 product can accommodate one disk with a
capacity of 160-500GB.
Recording Capacities for 4 Channel 500GB
These times are approximate as MPEG4 compression reduces
the file size if subsequent frames have not changed. These are based on
continuous recording. Times for a 250GB hard drive will be approximately half
that of the 500GB.
| Record Mode |
Quality |
Images /Sec |
Record Time Hours |
Record Time Days |
| Frame |
Best |
25 |
127.78 |
5.3 |
| 12.5 |
236.11 |
9.8 |
| 6 |
511.11 |
21.3 |
| 3 |
980.65 |
40.9 |
| High |
25 |
159.72 |
6.7 |
| 12.5 |
305.55 |
12.7 |
| 6 |
633.89 |
26.4 |
| 3 |
1209.72 |
50.4 |
| Normal |
25 |
179.17 |
7.5 |
| 12.5 |
352.78 |
14.7 |
| 6 |
626.11 |
1228.6 |
| 3 |
1263.88 |
52.7 |
| Basic |
25 |
222.22 |
9.3 |
| 12.5 |
405.56 |
16.9 |
| 6 |
927.78 |
38.7 |
| 3 |
1637.5 |
68.2 |
| CIF |
Best |
100 |
763.89 |
31.8 |
| 50 |
1416.67 |
59.0 |
| 25 |
2156.94 |
89.9 |
| 12 |
4134.72 |
172.3 |
| High |
100 |
965.28 |
40.2 |
| 50 |
1655.55 |
69.0 |
| 25 |
3398.61 |
141.6 |
| 12 |
4833.31 |
201.4 |
| Normal |
100 |
1120.83 |
46.7 |
| 50 |
2166.38 |
90.3 |
| 25 |
4105.56 |
171.1 |
| 12 |
5154.17 |
214.8 |
| Basic |
100 |
1563.89 |
56.2 |
| 50 |
2494.44 |
103.9 |
| 25 |
4472.22 |
186.3 |
| 12 |
6681.94 |
278.4 |
Monitor
There are 2 monitor outputs, Main and Call, which can be
connected to a standard composite sync. CCTV monitor.
An optional VGA output allowing the use of any standard PC
type LCD monitor can be provided by using the M-VIDEOCONSOLE product.
Covert Monitoring
Certain channels can be blanked out in the live view but
are still recorded for review by the administrator.
Triplex Operation
Recording can continue while playing back or reviewing images.
Triplex operation is available even when viewing over a LAN or the internet.
Accessing the menu to make set-up changes disables
recording. Menu access is password protected to administrator and conditional
users.
Network
A network connection is standard. Ethernet TCP/IP and remote view software are provided as
standard.
An example of the Remote View API is shown below.
You can also view the images through Internet Explorer.
The remote view allows full control of Pan/Tilt/Zoom
cameras (PELCO D).
Alarm notifications can be set-up as email images or
uploads to an FTP site's specific account
Backup
Backup can be made across a
LAN/internet connection to a PC where you can use the PC's CD burner to
made copies. Additionally you can backup to a standard VCR.
Search Modes
Finding the
required event can be achieved by searching in percentage, date/time or event
mode.
Additional
features
1 channel audio
recording, video loop through and 2 x digital zoom on playback.
Why Buy This Model
A cost effective and easy to use digital recorder with the
essential features of network connection, triplex operation and high resolution
and recording rates.
Ideal for home, shop or small business use. |
