Analysis of common problems in video capture card
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A: The difference between soft compression and hard compression is mainly in the execution of the compression algorithm. If the compression algorithm is executed by the CPU, it is soft compression. If the compression algorithm is operated by DSP or other compression chip on the DVR card, it is hard compression. .
2. How do you view the CPU usage of the soft press card?
A: For the above reasons, the soft press card needs more CPU resources than the hard press card. However, the main functions of the CPU and DSP are to perform calculations. Idle CPU resources and enable higher cost DSP means low CPU utilization efficiency. In many developed countries, most of them are soft pressure applications. Of course, the higher the utilization rate of the CPU, the better. The CPU resource occupancy rate exceeds a certain limit, which will cause instability or even crash of the system. There is a balance between the two. The JY-2000 monitoring software independently developed by our company controls the maximum usage rate of system resources within 80%. When the value exceeds this value because the configuration is lower than the system requirements, the system will automatically reduce the number of working channels, thus avoiding the crash and ensuring The system is stable. The higher the CPU frequency, the lower the occupancy rate.
3. What are the characteristics of the PCI Express interface standard?
answer:
1. Point-to-point connection method Compared with the traditional PCI bus, PCIExpress has a fundamental innovation in the way of working - using a point-to-point bus connection. We know that the traditional PCI bus works in an exclusive bandwidth mode. Only one device can communicate on the PCI bus at any one time. Once the devices on the PCI bus increase, the problem of bus control rights contention will seriously restrict the PCI devices. Performance is played. The PCI Express bus adopts a point-to-point connection method. Each device establishes its own transmission channel when it is required to transmit data. This channel is closed for other devices, and each channel does not interfere with each other, and the efficiency of data transmission is greatly improved.
2, serial transmission mode PCIExpress data transmission is serial mode, using "voltage differential signal transmission", that is, two lines, with the voltage difference between each other as a logical "0" "1" representation. Each two lines form a lane. The theoretical transmission rate of each channel is 2.5Gbit/s. In practice, there can be two transmission channels, which are divided into uplink and downlink, so that PCIExpress can work in duplex mode. Can provide higher transmission rates and quality. =
3. High-speed transmission PCI Express is divided into several forms: x1, x2, x4, x8, x16 and x32. The shape of x1 is the shortest, and the longer it is, the longer it is. They are backward compatible. The PCI Expressx16 single channel has 5GB/s (2.5Gb x 16/8=5GB/s) bandwidth, but due to the 8b/10b encoding, the de facto effective bandwidth is 4GB/s (after deducting 20% ​​of the embedded clock signal). Similarly, the "PCIExpressx1" single channel that replaces the current PCI slot should have a bandwidth of 250MB/s, while the traditional PCI bus has a bandwidth of 133MB/s. The high bandwidth of PCI-Express enables higher data throughput.
4, hot-swappable support (requires motherboard support) PCI Express bus data transmission distance of up to 3m, so that the hardware subsystems can be completely separated from each other in space, only cable connection. It supports hot-swap function, which can monitor all access devices in real time, so hardware manufacturers can design components that meet the modular requirements in shape and size. When users need to expand and upgrade hardware, they only need to unplug the old ones. The new plug-in is OK, no need to shut down.
5, good compatibility The PCI Express bus is also compatible with the PCI specification at the software level, and can be used without updating the operating system and BIOS. In the future, motherboards using PCI Express bus can still support PCI slots, and expansion cards of various PCI interfaces can operate normally in low bandwidth mode. This provides a basis for the rapid popularization of PCI Express without facing the embarrassment of waiting for software.
4. What are the advantages of video soft card based on PCI-Express interface?
A: The excellent data throughput capability of the PCI-Express interface, the large-capacity, high-quality, full-real-time stable video recording system for the video soft-press card breaks the bottleneck of the traditional PCI interface data transmission speed (currently JY-5008(A) Up to 32 channels of audio and video can be supported in full real time. It is recommended to use this card for more than 20 channels). At the same time, the increasingly popular and inexpensive Intel 945G series motherboard with PCI-Express interface also provides a good platform for its application and popularization.
5. What should I do if the number of PCI-Express interfaces on the motherboard is small?
A: At present, Intel 945 chipset motherboard with integrated graphics, the number of PCI-Express interfaces is usually 1~3, but the main series of the series usually have a PCI-Express16X discrete graphics slot, due to PCI- The Express interface standard is top-down compatible, so the PCI-Expressx16 discrete graphics card slot can also be used as a slot for video soft card based on PCI-Express interface. At the same time, because PCI Express is also compatible with the PCI specification at the software level, it is also possible to use the video soft compression card JY-5008(A) of the PCI-Express interface and the same series of video compression card JY-4004 (A) of the PCI interface. ), JY-4008 (A) mixed use, in order to get the most reasonable solution.
6. How do I know the IP address of the external (public) network of my monitoring host?
A: Log in to the homepage of our company's website on the monitoring host, and display a line in the middle of the screen: "Your current IP is: XXXX", this address is the external (public) network IP address of your monitoring host.
7. What are the factors related to the quality and stability of DVR image quality?
answer:
1. Surveillance camera: The selection of the CCD of the surveillance camera directly affects the image quality; the circuit board circuit design is unreasonable, which may produce color cast, noise, mosaic, etc., and the surveillance camera with infrared night vision function. If the working temperature of the infrared light board is too high, the circuit of the movement board will cause interference, and even the burning light will occur; monitoring the output voltage of the camera is too high (commonly known as: charged) will not only burn the camera itself but also burn out the video card. . It is recommended to choose a quality surveillance camera.
2, the video chip used in the acquisition card: different video chips have different performance capabilities for image processing, the common ones are: ConexantFusion878A, the resolution is good, the color is slightly worse; Techwell TW6800/6802 has very good non-real-time performance , clarity and color performance in general; PhilipsSAA7130/7134 image color and real-time performance is good, the overall performance is more balanced, before a large number of applications in TV cards, TV boxes and other products.
3, the circuit design of the acquisition card: circuit design and the quality of its components will directly affect the stability of the video card, especially for the monitoring of video such as the year-round operation of equipment is particularly important, low-quality components work Performance will be significantly reduced by a certain period of time. For example: capacitors, crystals, etc.
4, the overall working speed of the host: In addition to the CPU, memory, graphics card, etc. we are familiar with, including the motherboard's system bus speed, slot interface speed, north and south bridge chipset working speed, host power supply, etc. will be system Causes the operation of the DVR system to affect.
5, software design. The high-performance, low-occupancy, mature and stable software design is also an important guarantee for the long-term stable operation of the DVR.