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Video Capture Card Classification Identification 1. Soft Compression DVR
With soft card DVR we are generally called soft compression DVR, in fact, is a video capture card, with the card is equipped with monitoring software to achieve video surveillance, video, playback history video and remote monitoring functions, the hardware is one or more video capture chip (such as: fusion878a, saa7130/7134, tw6802B/6805, etc.) Receive signals from analog cameras, convert them to digital signals, and then directly or through the PCI bridge chip from the PCI gold finger into the motherboard, the original digital video signal, executed in memory The CPU instruction computes, compresses and processes the video, and stores it on the hard disk. In addition raw video data is sent directly to the video card and previewed by the monitor.
The circuit board of the soft card is very simple, there is no compressed chip and temporary storage chip on the board, the cost is low, generally about 1/3 of the hard compression, so the price is its greatest advantage, and in addition, we can see from the principle that the soft compression DVR There is a CPU for compression, so its compression quality is good, and its video resolution is high. With ample CPU resources, soft-compressed DVRs are no less than hard-compressed DVRs in terms of video, network, and other functions.
Second, hard compression DVR
Hard-compressed DVR, also known as video capture compression card, is basically the same as the soft-compression principle. The difference is that after the analog video is converted to a digital signal, it is not directly sent to the motherboard, graphics card, and memory through PCI, but is first compressed by hardware. The DVR card's own DSP replaces the computer's CPU to execute compression algorithm instructions, compress the memory chip on the DVR card, and then enter the motherboard through the PCI gold finger. Therefore, the hard-compressed DVR circuit board has more DSP or other compression chips and memory chips. Therefore, the main advantages of hard-compressed DVRs are mainly in the monitoring of large numbers. For example, 32-channel full-real-time surveillance video is difficult to achieve. This market gap can be occupied by hard compression.
From the above principle, we can see that the advantages of hard compression are:
1, video compression through its own DSP to complete, without taking up computer CPU resources;
2. Compression before entering the PCI bus can save PCI bus bandwidth. However, due to the current rapid increase in the CPU price/performance ratio, very inexpensive CPUs can easily compress 16 CIF video, leading to the gradual degradation of the hard card advantage 1, and with the advent of PCI-E on the motherboard, hard compression can save the advantages of PCI bandwidth. It is also weakening and eventually losing its meaning. Its main drawback is that the cost of the DSP chip on the card is very high.
3. The digital video is first compressed on the DVR card, and then the compressed video is decompressed and given to the video card monitor for preview display. In fact, we do not know that this process will cause the video signal to be damaged and the image quality will be degraded.
With soft card DVR we are generally called soft compression DVR, in fact, is a video capture card, with the card is equipped with monitoring software to achieve video surveillance, video, playback history video and remote monitoring functions, the hardware is one or more video capture chip (such as: fusion878a, saa7130/7134, tw6802B/6805, etc.) Receive signals from analog cameras, convert them to digital signals, and then directly or through the PCI bridge chip from the PCI gold finger into the motherboard, the original digital video signal, executed in memory The CPU instruction computes, compresses and processes the video, and stores it on the hard disk. In addition raw video data is sent directly to the video card and previewed by the monitor.
The circuit board of the soft card is very simple, there is no compressed chip and temporary storage chip on the board, the cost is low, generally about 1/3 of the hard compression, so the price is its greatest advantage, and in addition, we can see from the principle that the soft compression DVR There is a CPU for compression, so its compression quality is good, and its video resolution is high. With ample CPU resources, soft-compressed DVRs are no less than hard-compressed DVRs in terms of video, network, and other functions.
Second, hard compression DVR
Hard-compressed DVR, also known as video capture compression card, is basically the same as the soft-compression principle. The difference is that after the analog video is converted to a digital signal, it is not directly sent to the motherboard, graphics card, and memory through PCI, but is first compressed by hardware. The DVR card's own DSP replaces the computer's CPU to execute compression algorithm instructions, compress the memory chip on the DVR card, and then enter the motherboard through the PCI gold finger. Therefore, the hard-compressed DVR circuit board has more DSP or other compression chips and memory chips. Therefore, the main advantages of hard-compressed DVRs are mainly in the monitoring of large numbers. For example, 32-channel full-real-time surveillance video is difficult to achieve. This market gap can be occupied by hard compression.
From the above principle, we can see that the advantages of hard compression are:
1, video compression through its own DSP to complete, without taking up computer CPU resources;
2. Compression before entering the PCI bus can save PCI bus bandwidth. However, due to the current rapid increase in the CPU price/performance ratio, very inexpensive CPUs can easily compress 16 CIF video, leading to the gradual degradation of the hard card advantage 1, and with the advent of PCI-E on the motherboard, hard compression can save the advantages of PCI bandwidth. It is also weakening and eventually losing its meaning. Its main drawback is that the cost of the DSP chip on the card is very high.
3. The digital video is first compressed on the DVR card, and then the compressed video is decompressed and given to the video card monitor for preview display. In fact, we do not know that this process will cause the video signal to be damaged and the image quality will be degraded.
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