By PURPLELEC | 07 June 2024 | 0 Comments
What are the configuration requirements of the host for the HD video capture card?
Different applications require different video capture cards. Since most video capture cards currently use soft compression mode, this has certain requirements for the computer's CPU, GPU, etc. The video capture card performs video capture and compression simultaneously, which means that the video stream is compressed into an MPG format file when it enters the computer. This process requires the computer to have a high-speed CPU, sufficient memory, high-speed hard disk, and smooth system bus.
So the CPU main frequency must be fast and the memory must be large. If the machine speed is slow, it will take a long time to generate an AVI file. If only the screen preview is done, the CPU main frequency must be above 2.0G. If high-definition video is captured, the Intel Core quad-core dual CPU processor is the minimum requirement. In addition to reducing power consumption and area, the video capture card must also reduce the system CPU occupancy rate as much as possible, especially the current audio and video streaming media capture card, which is generally a soft compression card. The general video A/D converter is used to realize the acquisition of video images, and the automatic acquisition of video images cannot be completed. The entire acquisition process is completed under the control of the CPU, and the CPU starts the A/D conversion and stores the data in the frame memory. Its characteristics are that data acquisition takes up CPU time and has high requirements on the processor speed. Meifit professional audio and video streaming capture card, image processing such as scaling and deinterlacing that consumes CPU time is completed in FPGA, which greatly reduces the burden on the CPU. At the same time, the high-efficiency DMA transmission method further liberates the CPU's ability, allowing the CPU to focus on the work specified by the user.
The hard disk is the key to this configuration. It not only needs a large capacity, but also a fast storage speed. Of course, the larger the capacity, the better. In addition, you can also buy a high-speed hard disk with DMA100 or more and 7200 rpm. Although they are slower, they can also be basic. The machine hard disk capacity is preferably a SATA hard disk. It takes about 100M hard disk space to collect a 10-minute MPG file. The generated AVI file capacity is larger, and the 1-minute AVI file is about 60M. The capacity required for high-definition video acquisition is even larger, so prepare 2T.
Host interface, to collect different video signal sources, the connection between the video capture card and the signal source requires a corresponding video input interface. Similarly, the computer where the video capture card is installed also needs to have a corresponding host interface, otherwise the video capture card will be useless. At present, the host interface of the video capture card mainly uses PCI, PCI-E, USB and other connection lines with various components and peripheral devices. The PC plug-in video capture card in the Meifit series capture card needs to be used on a PC with at least one slot that meets the corresponding bus standard (such as PCI, PCI-E, etc.). The USB image acquisition box needs to be connected to the USB interface of a desktop or portable computer that supports USB1.1 or 2.0. When installing a high-definition capture card, at least one PCI-Express 1X or above socket (excluding the graphics card socket) is required to meet the preview requirements of up to 1920*1200. The high-speed PCI-Express interface and high-speed large-capacity image cache technology are used to effectively avoid the occurrence of screen drawing.
In order to record high-quality sound and music, the computer should be equipped with a 64-bit or higher sound card. Use the sound card to add music to the film and add it during video capture. Add a 2-to-1 converter to the audio input port of the sound card, connect two inputs, one for the audio output of the video recorder (used to capture the original sound of the videotape), and one for the audio output of the player (used to add accompaniment music). Connect a microphone to the microphone port to add voice-over or commentary. If you want to record high-quality sound or music, a 64-bit or higher sound card must be installed on the host. The audio output of the sound card is directly connected to the audio input of the compression card. The audio output of the compression card is connected to the audio input of the video recorder and the other to the speaker. However, some video capture cards have audio signal capture input, which is very convenient. For example, the Meifit T306E six-channel audio and video capture card can simultaneously capture 6-channel standard-definition video signals and 6-channel stereo analog audio signals, and supports 6-channel CVBS standard-definition and 2 6-channel stereo line audio signal inputs.
The graphics card is very important, but it does not have to be very high. Choose according to your own situation and see if the acquisition supports independent graphics card/integrated graphics card. It is recommended not to use a copycat graphics card, because the copycat graphics card is modified from the old graphics card chip, and the driver is actually wrong.
As for video memory and memory, the mainstream configuration of 2G memory and 1G video memory in today's computers is not too stressful for video acquisition. Of course, if it is 4G memory, it will be even better. After all, the current high-definition video acquisition cards all use memory buffers to achieve high speed to meet the requirements of real-time applications. For example, the T620E high-definition two-way DVI/VGA/HDMI audio and video acquisition card has onboard memory: 128MB DDR2 per channel, operating frequency of 160 Mhz, bit width of 32bit, host interface PCI-Express x4, 480MB/s transmission bandwidth, image processing such as scaling and de-interlacing that consumes CPU time is completed in the FPGA, which greatly reduces the burden on the CPU. At the same time, the high-efficiency DMA transmission method further liberates the CPU's capabilities. Supports simultaneous acquisition of dual-channel high-definition signals, and the onboard memory is 128MB DDR2 per channel (general video acquisition and display solutions require the use of 2 DMA channels and 2 SDRAMs as cache, which are used together for image processing).
Other motherboards, power supplies, monitors, etc. are not a big problem. Of course, there are also problems that some motherboards are incompatible with video capture cards. The power supply should be stable and quiet. It is recommended to choose a large size monitor.
In addition, video capture cards have different requirements for the host's operating system, acquisition software, and encoding software. You can contact the manufacturer during use.
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