Advantages and disadvantages of soft compression DVR card and hard compression card
Soft compression DVR card and hard compression card advantages:
1) Service life
The DVR product is updated quickly. The fastest change is the compression algorithm and software function. The soft compression card (referred to here is the genuine soft compression card) is flexible. It does not fix the software and compression algorithms in the chip. Flexible, not easy to be eliminated, once there is a more efficient compression algorithm, you can quickly improve your DVR quality through free software upgrades, while hard compression DVR is to write compression algorithm to DSP chip, upgrade trouble, short service life It is well known that MPEG-1 hard compression cards with a value of several thousand or even more than 10,000 yuan in previous years have been eliminated in less than one year because they cannot be upgraded.
2) Compression efficiency
In terms of video compression capabilities, hard compression is superior to soft compression. Soft compression card uses CPU compression, consumes computer resources, and reasonable configuration of the computer is the key to long-term stable operation of soft compression DVR. With the market's mainstream CPU performance and speed, the soft compression processing capability is also strengthened. The ordinary Celeron 1.7G can compress 4-8 channels (352 X 288) in real time. Once the 64-bit Windows operating system is available in the near future, Soft compression cards use a cheap AMD 64-bit CPU to compress video, which is a light and easy thing. Compressing 32 channels in real time will no longer be a problem. At this point, soft compression will probably replace the hard compression card.
In terms of compression ratio, many soft compression DVR cards commonly available on the market are early foreign products. They use wavelet algorithm or even MJPEG. They consume large hard disks and have poor network performance. Recently, most of the newly released soft compression DVR cards use MPEG-4. Or H.264 algorithm, each channel accounts for 30-150M per hour.
3) Hardware costs
In terms of board cost and price, soft compression cards have obvious advantages. The price of soft compression cards is generally only 1/4~1/3 of hard compression cards.
4) Image quality
In terms of image quality, the video capture chip, circuit anti-aliasing, resolution and compression algorithm are mainly determined. The compression algorithm and compression ratio determine the image quality of the playback DVR video. Some pirated Kodicom and Pico sold in the market are soft in foreign countries. Compression card, due to the 8-bit FUSION878A as the video capture chip, the image quality is not as good as the hard compression card using PHILIPS chip, but the soft compression also uses PHILIPS7130, 7134 chip, such as Ether 8404B DVR card
5) Network performance
On the network side, soft compression is mostly better than hard compression cards. Perhaps it is because the development of soft compression DVR manufacturers is more powerful, but the network performance is not related to soft compression or hard compression. The network performance is related to the compression algorithm. Advanced compression algorithms have better compression ratios, lower data rates, lower bandwidth requirements, and better network performance.
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