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Video Compression DVR: compression hardware compared to software compression

PC-based DVR systems are become the choice for system integrators and users of monitoring because of its scalability, flexibility and ease of customization. But the choice of a compression system hardware or software compression system can make a big difference.

By Nion Security Technology

Based PC to DVR systems rely on systems integrators and users because of its unique flexibility and scalability. Adding compression card, the system can support more video channels and the desired functionality can be obtained by the addition of daughter boards. On the other hand, provided SDK allows the system to be customized DVR to meet specific needs. A system captures PC DVR Surveillance video in real time and saves on your Hard Drive. To do this, it must receive the signal and compress and store them in a video file disk. Each card captures a number of images per channel (for example, a card that captures 16 channels of 100 frames per second total, 6.25 for the capture channel when capturing 400 frames per second, can capture 25 per channel). Then, the system must be compressed and saved. Whether through a software process, or the card DVR.

It is important to note that a system based on DVR-PC can be performed using a compression card of software or hardware compression card. As its name indicates a compression software (SCS) uses the card signal capture and software to compress. Is your Computer Processor and RAM to do this work, which comes at a high cost of system resources.

Hardware compression system (HCS), not only uses the card to capture the signal, but also compressed. Have one or more sets of chips on the map who are responsible to capture, compress and store video on the Hard Disk.

Compression System Software
The biggest problem DVR system is the software compression load on the CPU. This means that the processor in your computer, and busy with other things, is now widely used by the DVR system. This may not be a problem with DVR systems running at a lower frame rate, but faster, real-time systems, where the processor 4CIF images at 400 to compress each other, the processor can quickly max. Why is there a problem? There are several reasons.

First, Not all managers have the same size, or they do not need all the same amount of work to process, meaning that the workload is changing what compression codec used. In addition, the CPU is busy processing things other GUI (graphical user interface) changes, reproductive functions, motion detection and network operations, to name a few. With the CPU under heavy use, some number of large frames in a row can cause serious problems.

With the normal functioning PC that looks all the time. A simple process waiting their turn in the CPU, so you'll see a window to take more time to re-draw, or the screen takes longer to load. It normally not a problem. But with the DVR operation, jams bad news "is. 400 fps (4CIF resolution), this team has too, too quickly and starts dropping frames. Marco drop means gaps or "spots" of video and audio devices. You may not notice failures casual, but if your CPU is more than a few of them, you'll see. In severe cases, congestion may cause the computer to crash completely.

Because the hardware compression DVR system uses its own chips for compression, almost never the load on the computer CPU and RAM is much lower loss of images in these systems.

Hardware Compression System

System compression hardware has one or more sets of chips map you are responsible for the capture, compress and store video on the hard disk. This means that you have good performance with low CPU and RAM PC. For this reason, a DVR hardware compression is much more stable than the compression DVR software.

And hardware compression cards typically used for high performance chips to compress images, compression process is not affected or interrupted by other programs. Bring the video seamless to customers. Compression "Even DSP Ti, and a regular supplier of DSP hardware, are very different from the video quality. "Said Security Nion engineer David. As the DVR market, the basis of Ti DSP DVR is a little expensive than normal DSP chipsets.

Meanwhile, with low occupation of the CPU, the system hardware compression can easily be achieved by additional functions of resource use replacement of the computer system, such as intelligent analysis, recognition of the plate and so on. network performance can be connect better and, in particular, the rapid transmission speed and multi-channel simultaneous connection.

compression hardware systems can also easily handle up to 64 channels on a PC with real-time monitoring and recording in real time (each channel is 25fps for PAL NTSC or 30 frames per second). More software compression system is only compatible with 16 channels.

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