Hikvision DS-6908UDI(C) 8 x HDMI Out - 4K Decoder
- CCTV Lens Guide
- Hard Drive Size Guide
Unless selecting a vari-focal camera (with an adjustable lens) It is important to select the correct camera lens option for where the camera is to be positioned. A smaller lens will give you a wider angle but will be "zoomed out more", while a bigger lens will narrow the angle down and "zoom in more". See below to give you some idea on angles of Megapixel HD Cameras:
| Lens in mm | Approx Viewing Angle (degrees) | Ideal Distance (metres) | Typical usage/notes |
|---|---|---|---|
| 2.8 | 106 | <6 | For seeing as much of the immediate area as possible such as above a doorway/low down/garage soffits (edges can appear slightly warped/distorted) - clearly "zoomed out" |
| 3.6/4 | 83-90 | <12 | A great general purpose option giving great coverage still in the corner of a room or higher up on second floor soffits with less distortion - more of a natural "zoom" |
| 6 | 56 | 6-20 | Narrows down the angle and zooms in to look past the immediate area a little to gain more detail - down a driveway for example from higher up |
| 12 | 24 | 20+ | Zooms in significantly more to look at a gate, entrance or adjascent building |
| 16 | 19 | 24+ | As above but more so |
The amount of hard drive space you require is dictated by how many cameras, as well as their resolution, frame rate settings, and whether you have H.265 encoding enabled or not to save space (We advise turning it on to double the capacity shown below with ease).
Finally, you can often make your storage space last a lot longer by enabling motion-detected recording rather than continuous, especially if there are long periods of no activity (to perhaps double or more these figures again).
|
Resolution (Megapixels) |
Days of storage provided by 1TB per camera (continuous - full 25 frames per second) |
Days of storage provided by 1TB per 4 cameras (continuous - full 25 frames per second) |
Days of storage provided by 1TB per 4 cameras (50% motion- 15 frames per second) |
|---|---|---|---|
| 1 | 44 | 11 | 36 |
| 2 | 22 | 5 | 18 |
| 3 | 17 | 4 | 14 |
| 4 | 11 | 3 | 9 |
| 5 | 9 | 2 | 8 |
| 6 | 8 | 2 | 6 |
| 8 (4K) | 5 | 1 | 4 |
| 12 | 4 | 0.5 | 3 |
As a rule of thumb, we recommend 2 Terabytes for a 4 x 4/5MP HD camera setup, as this should give you approx 2 weeks using H.265 @ 20fps and that is on continuous, not motion-detected recording.
(You may only require the full 25 frames per second on certain cameras if things are fast-moving - ie above a till)
You can also use the Hikvision online calculator to work out what works best for you specifically: https://tools.hikvision.com/ca...
(All of our hard drives come fitted and are CCTV-specific from one of the major brands)
4K Decoder
- Video Input
- Support computer, video conference terminals and other devices to serve as video input signal source.
- Support HDMI and HDMI 4K signal inputs.
- Support network camera, NVR, and other devices to serve as network signal source.
- Support HDMI embedded audio input.
- audio input supports 16 bit and 48K Hz sampling, two-channel and stereo sound.
- Support 2-ch 1080p@50/60 or 1-ch 4K@30 encoding via HDMI 1.4 input interface.
- Video Output
- Support 4K (3840 × 2160@30 Hz) UHD video output via HDMI 1.4 output interface.
- Support two audio output methods: embedded HDMI audio output and external audio output.
- Adopt frame synchronization technology to ensure complete synchronization of images from all output ports, complete pictures, smooth playback, and without lag, frame loss, tearing or splicing.
- Video Encoding and Decoding
- Support H.264 and H.265 encoding of input boards, and sub-stream and mainstream encoding; the default encoding format is H.264.
- Support network cameras, NVR, and other network sources decoding of output boards, sub-stream and main stream decoding including H.264, H.265, Smart264, Smart265, MJPEG, HIK264 and main encapsulation formats such as PS, RTP, TS, ES.
- Support up to 128 video decoding channels and simultaneously decoding of 64-ch 2MP or 128-ch 720p video decoding on the wall.
- Support decoding streams of multiple resolution no more than 32 MP.
- G.722, G.711A, G.726, G.711U, MPEG2-L2, AAC, MP3, PCM audio compression.
- Support rotate mode of front-end cameras decoding and up to 2560 × 1440 decoding output.
- Two decoding modes: active decoding and passive decoding.
- Support encryption stream, multi-channel stream, and smart stream decoding.
- Support stream editing and switching, and auto switching to the sub stream when the divided window quantity reaches the upper limit.
- Support remote video files decoding output.
- Video Wall
- Support single video wall splicing, window opening, window roaming, scene switching, and windows switching.
- Support up to 3 1080p or 1.5 4K signal source windows per screen and each signal source window can be divided into 1, 2, 4, 6, 8, 9, 12, 16, and 25 windows.
- Support up to 64 scenes. You can customize the video wall layout and save it as a scene.
- Support 256 auto-switching plans. You can customize the camera, scenes, and time for each plan.
- You can double click the roaming window to zoom in and zoom out for one roaming window or divided roaming sub-window.
- Support displaying output channel number.
- Support operating network signal sources on video wall in eight directions, including auto-scanning, adjusting aperture, changing the focal length, focusing, and calling preset.
- Support starting/stopping the live view of the window, starting/stopping decoding, starting/stopping switching windows, turning on/off the sound, displaying the window on the top/bottom layer, and other operations.
- Support video recording playback. You can start or stop playback and select the video recording time.
- Support using smart wall clients to cast the screen on the wall.
- Support the live view of network signal sources over RTP/RTSP.
- Device Access
- Support docking with 32 MP PanoVu series cameras, fisheye cameras, and conventional front-end network cameras, DVR, NVR, and XVR.
- Support complete software development kit (SDK) for third-party developers.
- Support using the ONVIF and GB28181 protocol to access the decoder.
- Support LCD information interactive, including display information acquirement, image settings, series ports control, time synchronization, backlight parameters configuration and acquirement, output port auto-binding, error code reporting.
- Maintanence
- Support using network keyboard or serial port keyboard to control the device, and support window switching, group operation and auto-switching, scene switching, PTZ control, and video wall playback via keyboard.
- Support the access and operation via PC client and Web client.
- Support Chrome 45+.
- Use the built-in gigabit switching network.
- Supports optoelectronic adaptation, link aggregation, and NAT.
- Support remote parameters configuration, getting system status and logs.
- Support daily maintenance such as remote restart, restore default settings and upgrading.
- Support auto fault detection and device exception alarm, including network disconnection, IP conflict, illegal access, temperature overshoot, fan status exception, decoding signal source exception and device exception.
- Support user permission management, allowing users with different permissions to use designated resources and operate designated video wall modules.
- Support visualization in operation and maintenance by displaying the network topology structure and keynote network status of main control units (MCU) and service boards.
- Support NTP time synchronization and manual time synchronization.
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