Deep Drawing Parts,Deep Drawing Metal Stamping Cover,Custom Metal Deep Stamping,Deep Metal Stamping JIANGSU TONGDE INTERNATIONAL TRADE CO.LTD. , https://www.jstongdetrade.com
Video acquisition compression card The difference between the circuit board card and the soft compression card is that there are more video compression and decompression parts of the circuit structure. Video compression is not passed to the computer CPU, but is handled by a DSP chip. So the hard compression card circuit is more complicated.
Comparison of advantages of soft compression DVR card and hard compression card 1) Service life
DVR product replacement is fast, the fastest change is the compression algorithm and software features, soft compression card (here refers to the genuine soft compression card) flexibility, it does not part of the software and compression algorithm is not fixed in the chip, upgrade Flexible, not easy to eliminate, once you have a more efficient compression algorithm, you can quickly improve your DVR quality through free software upgrades, and hard-compressed DVR is to write the compression algorithm into the DSP chip, upgrade troublesome, short service life As we all know, MPEG-1 hard compression cards worth a few thousand or even more than 10,000 yuan in previous years have been eliminated in less than one year due to inability to upgrade. 2) Compression efficiency
In terms of video compression capabilities, hard compression is better than soft compression. Since the soft compression card uses CPU compression and consumes computer resources, rational configuration of the computer is the key to the long-term stable operation of the soft compression DVR. As the market's mainstream CPU performance and speed increase, the soft compression processing capacity is also strengthened. Using an ordinary Celeron 1.7G can compress 4-8-channel (352X288) real-time. Once the 64-bit Windows operating system is available in the near future, the soft compression will occur. The use of inexpensive AMD64-bit CPUs for video compression has become an easy task. Compressing 32 channels in real time will no longer be a problem. At this point soft compression will probably replace hard compression cards.
In terms of compression ratio, many soft compression DVR cards that are 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. However, most recently introduced soft compression DVR cards mostly use MPEG-4. Or H.264 algorithm, each drive 30-150M per hour.
3) Hardware costs
In terms of board cost and price, the soft compression card has obvious advantages. The price of soft compression card is generally only 1/4~1/3 of the hard compression card.
In terms of image quality, video capture chips, circuit impedance, resolution and compression algorithms are mainly decided, among which the compression algorithm and compression ratio determine the quality of the playback DVR video, and some foreign pirates such as Kodicom and Pico are available on the market. Compression card, due to the use of 8-bit FUSION878A for video capture chip, image quality is not as good as the use of PHILIPS chip hard compression card, but soft compression also use PHILIPS7130, 7134 chip, such as Ether8404BDVR card 5) network performance
On the network side, soft compression is mostly better than hard compression cards, perhaps because the development of soft compression DVR manufacturers R & D strength is more powerful, but the network performance is indeed irrelevant to soft compression or hard compression, network performance is related to the compression algorithm Advanced compression algorithms have large compression ratios, small data traffic, low bandwidth requirements, and better network performance.
The advantages of video capture card and video capture compression card
Video Capture Card The circuit card is mainly composed of one or more video capture chips and peripheral components and circuits. The circuit structure is simpler than hard compression, and the cost is much lower than that of hard compression. This card is only responsible for capturing video, while video compression, decompression, and other video processing are performed by CPU operations.