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Soft compression card and hard compression card
The soft compression card, also called the video capture card, is mainly composed of one or more video capture chips and peripheral components and circuits, and the circuit structure is simpler than hard compression. This card is only responsible for collecting video, while video compression, decompression and other video processing are implemented by CPU operations.
The basic principle of soft compression video capture card: camera analog video signal input to DVR card, the analog signal is converted into digital signal by video capture chip, and then enter PCI directly or through PCI bridge chip, and then transferred to memory, graphics card, executed by CPU The compression algorithm in the DVR software compresses the huge video signal and stores it on the hard disk. A hard compression card, also called a video capture compression card, differs from a soft compression card in that it has more video compression and decompression part of the circuit structure. Video compression is not given to the computer CPU for processing, but to the DSP chip. To deal with it.
The basic principle of the hard compression video capture card: the camera analog video signal is input to the DVR card, and the analog signal is converted into a digital signal by the video capture chip, and then transmitted to the temporary memory of the card, and then the video compression chip is provided on the card. The compression algorithm is executed to compress the huge video signal to a small size. Finally, the compressed ones enter the PCI directly or through the PCI bridge chip and are stored to the hard disk.
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.
There are a wide variety of video capture cards, but for those amateurs who do not have a lot of commercial video capture processing, an inexpensive video capture card without hardware compression, or a TV card with a capture function and a 3D graphics card. It is fully competent. As long as you work hard on the software, you can get the same processing results as those of high-end and expensive video capture cards. Of course, in the process of making movie files in the later stage, it will take you more time. The video capture software that comes with those cheap or integrated cards is usually too simple, especially in the real-time file saving engine. The result of directly using these simple acquisition software for video capture processing is often difficult to satisfy.
Analog capture card and digital capture card
From the video signal source and the interface of the capture card, the video capture card is divided into two categories: one is the analog capture card, and the other is the digital capture card.
The analog capture card collects the analog video signal into the PC through the AV or S terminal, and converts the analog signal into a digital signal. The video signal source can be from an analog camera, a television signal, an analog video recorder, and the like.
The digital capture card uses the IEEE1394 digital interface to digitally and digitally collect the digital video signal into the PC without loss. The video signal source mainly comes from DV (digital video camera) and other digital devices.
An important difference between the analog capture card and the digital capture card is that: using the digital capture card, there is no loss of the video signal during the acquisition process, which can guarantee the same effect as the original video source, and the video signal will have a certain degree when using the analog capture card. Loss. Someone has made an analogy: analog acquisition is similar to using a video recorder to flip a video tape. The sub-bands that are ripped are always inferior to the master tape. If you use the sub-band to rip, the effect will be worse. Digital capture is like copying with a computer. Like the data file, no matter how many times it is copied, the copied file is exactly the same as the original file, and there is no difference. The two-in-one capture card refers to the digital analog capture card and the AV+DV capture card. Digital input and output, analog interface input (DV/AV/S-video), full interface board.
External collection box and built-in capture card
External USB video capture card and built-in PCI interface video receiver card.
These two things have their own advantages and disadvantages. If your funds are not sufficient, you are recommended to use the built-in PCI video receiving card. The PCI card is recommended for the plug-in card. At the same time, it also has the following advantages: First, it must be that the price is much cheaper than the external one. Secondly, it does not occupy the external desktop space. Now there are too many peripherals on the computer table, if too much is placed The third thing is that the built-in video card does not need an external power supply, which not only saves the position of a power plug, but also reduces the situation that the power connection line is too much and is very messy, and can also avoid the mains voltage. Unstable video quality degradation occurs; Fourth, most of the built-in video receiving cards can be multi-tasking under Windows: built-in video card weakness; susceptible to electromagnetic interference from internal computer components, causing The playback quality is degraded; when the board is installed, it is more troublesome than the external one. It must be opened before the chassis can be installed. It is easy to conflict with other computer equipment when installing the driver or software. The advantages of the external capture card are Obviously, the external performance is more stable than the built-in video receiver card. It requires an external power supply and a parallel port on the computer, which causes a lot of inconvenience to friends who have connected more peripherals.
What are the basic types of video capture cards?
[ Huaqiang Security Network News ] Video capture card, also known as video capture card, can be used to obtain digital video information and store and play it out. Many video capture cards can acquire audio at the same time as capturing video information, so that the audio portion and the video portion are simultaneously saved and synchronized during digitization. There are several basic types of video capture cards: