By PURPLELEC | 19 October 2023 | 0 Comments
How to choose a capture card for live streaming
A wonderful game live broadcast or live broadcast with goods is inseparable from the assistance of a capture card. It can collect HDMI audio and video signals output from mobile phones, computers, game consoles, etc., and input them into laptops, and then use live streaming software to process them. Edit, live stream or record backup to achieve better image quality.
The capture card connects the SLR or mirrorless images to the computer. So how do we choose the capture card during live broadcast?
1. Capture cards are divided into built-in capture cards and external capture cards
Image capture cards can be divided into external capture cards (boxes) and built-in boards according to the installation link method. The capture card in the form of a plug-in card is called a built-in capture card. The advantage of this form is that it can support the simultaneous access of multiple cameras. Most of them can achieve multi-tasking under Windows systems. Generally, we insert it into the PCIE card of the desktop computer. above the trough. Secondly, the price is much cheaper than external ones, and it does not take up external desktop space. There are too many peripherals on the computer desk now, and it is annoying if there are too many; in addition, the built-in video card does not The need for an external power supply not only eliminates the need for a power plug, but also reduces the clutter caused by too many power cables. It also avoids the degradation of video quality caused by unstable mains voltage.
2. It is necessary to distinguish whether it is USB2.0 or USB3.0
USB2.0 interface:
All computers are equipped with USB2.0 interfaces, which are convenient for connection and do not require a capture card.
The USB2.0 interface camera is one of the earliest applied digital interfaces. It has a short development cycle and low cost. It is currently the most common type. The disadvantage is that its transmission rate is slow, with a theoretical speed of only 480Mb (60MB).
During the transmission process, the CPU participates in management, occupying and consuming a large amount of resources. The USB2.0 interface is unstable, and cameras usually do not have solid screws, so there may be a risk of loosening on devices that move frequently. The transmission distance is short and the signal is easily attenuated.
USB3.0 interface:
The design of USB 3.0 adds two sets of data buses based on USB 2.0. In order to ensure downward compatibility, USB 3.0 retains a set of transmission buses of USB 2.0.
In terms of transmission protocol, in addition to supporting the traditional BOT protocol, USB 3.0 also adds the USB Attached SCSI Protocol (USAP), which can fully take advantage of the high-speed bandwidth of 5Gbps. USB 3.0 offers the plug-and-play advantages of USB 2.0 while also allowing for higher data transfer rates.
The advantages of the USB 3.0 interface are bandwidth higher than 350Mbps, no additional cost of a separate frame grabber, widely available plug-and-play hardware, and low CPU load. Most new devices - from PCs to the smallest PC Cards - offer USB 3.0 embedded connectivity.
3. Do you need a 4K capture card?
The 4k capture card is an output for capturing 4K video. Its function is very similar to other USB capture cards. It can capture uncompressed video anytime and anywhere without configuration or special drivers.
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