Embedded Network Video Recorders (NVRs) over Windows-based NVRs Comparison

Embedded Network Video Recorders (NVRs) over Windows-based NVRs Comparison

Video surveillance users who opt for an NVR using an embedded, dedicated Linux operating system within a self-contained unit will benefit from performance which is superior to that offered by a Windows-based NVR in terms of ease of use, system stability and decoding capability.

Embedded NVRs are distinguished from WINDOWS-based NVRs primarily on how they operate and the features they provide. The stand-alone NVR comes in a single, compact enclosure. By contrast, a WINDOWS-based NVR is a peripheral addition to a system involving a CPU, keyboard and monitor. In confined locations, an embedded unit performs a similar if not wider range of functions while occupying less space. Embedded NVRs have overcome their perceived shortcomings in terms of storage capacity and types of storage medium through use of devices including IP-SAN, eSATA, NAS (network-attached storage) and Fire wire.  Furthermore, embedded NVRs can support interfaces to other surveillance devices which can be conveniently integrated with alarm systems and access control systems as well as PTZ remote control systems.

Functions common to the two approaches
Some common functions between the two video recording solutions in the surveillance market, it will be useful to list the core functions that are common to both approaches. These include: recording; archiving; display; playback; search on parameters such as date, timeline and event; camera management; triggered recording on prescribed events and export to removable media. NVRs are also usually expected to be able to handle VoIP packets. Once digitalized video has been streamed, end-users expect to be able to treat it like any other network data, viewing it locally, on LANs and remotely from web browsers. They also expect to be able to exercise PTZ control over cameras remotely, configure settings and even perform upgrades remotely.

Storage

Although NVRs have ample internal recording and storing space, the PC-based systems offer as much as seven times more storage, when compared to an NVR. This advantage is, however, addressed by NVRs, through the provision for external storage options (USB storage devices, eSATA devices, Firewire storage devices, NAS appliances, etc.)

Reliability
The precise architecture of the embedded NVR units makes them less prone to crash. However, the WINDOWS methodology for NVRs is certainly 'open' in terms of the addition of external storage, installation of software etc. The controls are embedded into the NVR; they are an integral part of the panel rather than an adjunct, and the activity of operators can therefore be more easily restricted to legitimate usage.

Stability
Unlike a WINDOWS-based unit which is likely to run a range of Windows™ applications, an embedded NVR benefits from the stability that comes with Linux code which is optimized to run only applications relevant to the surveillance tasks required. An embedded operating system contains only the software components necessary for the specific functions of the NVR, and the unit will be supplied with optimum configurations straight from the factory after rigorous testing.

Scalability

An NVR is designed to offer optimal performance for a set number of cameras, and is normally less scalable than a WINDOWS -based system. This makes the unit suitable for smaller systems where the number of cameras stays within the limits of an NVR’s designed capacity.

Boot Time

The NVR runs an embedded operating system as compared to a WINDOWS -based system, which needs to run an application under the Windows OS before it begins recording. This means that the NVR will start faster as compared to the WINDOWS -based system; which will take longer to load.

Complex decoding
Embedded NVRs consistently outperform WINDOWS-based solutions in their ability not only to perform complex decoding but also to give the user reliable video playback and preview. Currently, certain NVRs are among the few units which can perform both local decoding and playback, with decoding of up to 16 channels at 1080p being achievable. The processing demands made on a WINDOWS-based solution to achieve comparable performance are far higher than those required of an embedded device, and necessitate powerful, expensive CPUs.

Power consumption and manufacturing carbon footprint
Embedded technologies are helping the surveillance industry to go green in marked contrast with the WINDOWS approach. The power consumption of an embedded NVR is approximately 70W which is less than an incandescent light bulb. By contrast, the likely power consumption of a WINDOWS capable of running an NVR is approximately 200 watts and together with a large enterprise-grade monitor, the total figure will be about 300 watts. For any end-user mindful of their carbon footprint, these figures alone must do much to settle the debate.

Ease of Use
Embedded NVRs can have operating panels based on the very best intuitive design principles. LED signals, digital inputs and outputs, push buttons and dials can all be arranged in an ergonomic way. Sensible layout in a panel approach rather than a screen-based GUI can replicate the ease of use found in a WINDOWS but without the vulnerabilities described above.

ONVIF

Linux based Network Video Recorder for multi-brand and ONVIF compliant multi-megapixel IP cameras and basic automation.