When using a video capture card, you need to connect it to a camera to capture images normally. Let's take a look at the interface types of video capture cards with the editor.
1. There are 7 common interfaces for video capture cards, which can be divided into two categories: digital signal interfaces and ana-log signal interfaces.
2. Digital signal interfaces include: HDMI, SDI, DVI, VGA, color difference components; ana-log signal interfaces include: AV, S terminal.
3. The external video capture card also has a USB interface, which is used to connect to the USB interface of the computer and transmit the captured video signals to the computer.
4. At present, video capture cards usually use a 32-bit PCI bus interface, which is inserted into the expansion slot of the PC motherboard to realize communication and data transmission between the capture card and the PC. The capture card must have at least one composite video interface (videoin) to connect to ana-log video devices. High-performance capture cards generally have a composite video interface and an s-video interface.
1. There are generally two types of mainstream motherboard interfaces for video capture cards, one is the PCIe interface and the other is the USB interface. The PCIe interface slot is in the host computer of the desktop computer. Different slots of the PCIe bus have exclusive bandwidth, which is suitable for multiple capture cards to capture video at the same time. The USB interface slot is outside the desktop computer and laptop, which is more convenient. But the maximum data transfer speed is lower than PCIe. Each port of the USB bus shares bandwidth, so it is more suitable to use a USB capture device to capture video.
2. PCI was initially used in servers and gradually in personal computers. Currently, motherboard manufacturers rarely equip motherboards with PCI slots and use PCIe slots instead. Therefore, in the current market, except for a few domestically produced low-end video capture cards or cards that were developed earlier, most video capture cards use the PCIe interface. Magewell capture cards, positioned in the mid-to-high-end video capture market, also use PCIe interfaces.
3. The PCIe interface is widely used. In addition to being used in video capture cards, many solid-state drives, network cards, graphics cards, and sound cards use this interface. The PCI slot can be plugged into all PCI devices, and the PCIe slot can be plugged into all PCIe devices, but currently the PCI slot is only used to plug in network cards, sound cards, TV cards, and various port expansion cards! Because graphics cards are basically plugged in separately, and most sound cards and network cards are integrated into the motherboard, PCI is rarely used now.
