How Do I Choose the Best Cheap Video Card?

The capture card is mainly a capture device that captures external optical, video, audio and other analog signals and digitizes it into a computer for digital processing. It mainly uses image capture cards, video capture cards, audio capture cards (such as sound cards), and data capture cards. It is a device that can collect, quantify and encode analog video signals. Video capture cards are divided into broadcast-grade video capture cards, professional-grade video capture cards, and civilian-grade video capture cards. The main difference is that the captured image indicators are different. ^[1] Since industrial acquisition cards such as data acquisition cards are not commonly used, general acquisition cards default to static image acquisition cards and dynamic video acquisition cards. Therefore, the capture card is also called a video capture card, which can be used to obtain digital video information and store and play it. Many video capture cards can obtain audio while capturing video information, so that the audio part and video part are saved and played simultaneously when they are digitized. The video capture card is called "Video Capture Card" in English. Its function is to capture video signals and audio signals to a computer and save them on the hard disk in the form of data files.

Capture card

Video capture equipment--

When processing video signal transmission,

Video is multiple still images (

On the computer, you can receive the analog video signal from the video input terminal through the acquisition card, and collect and quantize the signal into a digital signal.

Common

SD capture cards are gradually not meeting the requirements of each field, and the adoption rate of HD capture cards is gradually popular. Generally, HD capture cards will have inputs such as color difference, AV, and S terminals, and some have digital interfaces such as HDMI.The highest resolution is achieved. 1920 × 1080, which greatly meets the needs of various high-definition cameras. Can capture a variety of sources from high-definition 720P, 1080i to SD 480i / 480P, a good high-definition capture card can get full-resolution high-definition uncompressed video capture, which can ensure that the high-definition programs generated from high-definition material output completely retain the original Image Quality.

In terms of software compatibility, codec quality and system stability, it is also a sign of testing whether a high-definition capture card is good. There are also third-party software and development tools that support the standard DIRECT SHOW API for development, and whether they provide SDK secondary development kits that are compatible with many common non-editing software, such as Adobe Premiere pro. Many capture card manufacturers such as AVerMedia and other established capture card manufacturers have produced high-quality HD capture cards, which has greatly lowered the threshold for full-resolution live HD production. In the emerging HD capture field such as education recording and broadcasting, , Network video conferencing and remote training, high-definition medical, stunt booth and other multimedia high-definition video capture are widely used.

With the increasing popularity of high-definition capture and display devices, especially the heavy use of high-definition cameras and large-screen display devices, the problem of inconsistent refresh frequencies between capture devices and display devices is becoming increasingly serious. LCDs dominate the display market. Because the LCD screen has a display-preserving property (the image maintains a certain brightness during each frame of the display time), it is integrated with the visual persistence characteristics of the human eye. When the screen is large and the refresh rate is not high, it will cause a dynamic feeling when watching dynamic pictures. , Causing the resolution of dynamic objects to decline and cause visual fatigue. For video surveillance applications, the capture frame rate of video capture devices is generally 25 or 30 frames per second, while the mainstream refresh rate of display devices is 50Hz or 60Hz, which is higher than the capture device. The rapid development of the video field, video capture cards have been widely used in all walks of life, high-definition capture cards gradually replace SD capture cards, which has become the trend of market development. ^[6]

Capture Card HD Medical

With the popularization of HD in the medical industry, many system vendors will consider solutions for capturing HD ^[7] . HD capture cards and medical cameras record real-time recording of high-definition medical images. By supporting third-party software based on Microsoft Directshow and powerful SDKs, Secondary development kit, compatible with any medical equipment software, to capture high-quality images, with de-interlace function, effectively remove image ripples and flickers to make the picture clearer, text and time overlay settings function, convenient to record each acquisition situation And dates.

Acquisition card education recording

With high-definition cameras, it is suitable for the recording of quality courseware, and the audio and video are completely synchronized. By supporting third-party software based on Microsoft Directshow, you can record teacher teaching video sounds, student Q & A videos, etc. in real-time into the standard streaming media format required by national quality courses. Go to any server in the school, and synchronize the live or on-demand video on the campus network or internet to achieve the role of remote interactive teaching and campus class.

Capture card HD video

Capture high-definition or standard-definition video program source through the HDMI / color difference input interface of the HD capture card, and record it into the format you want (MPEG-1 / 2/4 * & H.264) with Aver MediaCenter software Or, by supporting third-party software based on Microsoft Directshow architecture, real-time recording into a variety of streaming media formats and uploading to the Internet provides a variety of high-definition high-quality program sources for IPTV.

Capture card web conference

Video conferences have been developed vigorously and have higher requirements for the image quality of video conferences, because video capture card functions are more diverse than USB cameras, and more and more enterprise users have also started using video capture cards. HD capture card adds HDMI and color difference input on the basis of ordinary capture card, which can capture 1080i HD source. Through analog cameras, AVerMedia C727 HD capture card can receive high-definition or standard-definition video signals from the video input. By supporting third-party software based on Microsoft Directshow architecture, real-time recording into the audio and video formats you need. Achieve remote "zero distance" communication.

Capture card HD capture system

The HD capture card supports multiple cards in one machine, which is an indispensable function for capturing HD video on multi-channel and angle equipment.

Capture card non-editing stunt collection

Some high-definition capture cards can also be used as non-editing I / O cards, compatible with many of the most popular non-editing software on the market. With non-editing software such as Adobe Premiere pro and VideoStudio, users can easily use HDMI and other interfaces. Ground Input Acquisition

How to choose a capture card

Among high-definition video capture cards, VGA capture cards are the most popular. They can not only capture computer screen signals, but also high-definition VGA camera signals, medical VGA equipment and instrument signals. Its application range is very wide, especially in video conferencing, webcasting, distance teaching, projection integration. However, there are many image capture cards on the market. How to choose the correct VGA capture card?

1. Before purchasing a VGA capture card, you should clearly define the requirements, such as the resolution you need to achieve, the soft compression mode or hard compression mode, and supported software. There are many models of VGA capture cards on the market. They may be manufactured by different manufacturers, and each type of VGA capture card is focused on a specific function. Therefore, before we buy a VGA capture card, So that the purpose of the acquisition card is clear.

2. Secondly, the built-in video capture card is mainly divided into PCI-E and PCI slot interfaces, and the bandwidth transmission speed of the PCI-E slot is twice that of PCI, so most high-definition video capture cards use It is a PCI-E slot interface, which requires that you use a motherboard with this type of slot.

3. Finally, video resolution is very important for video applications. For example, online video live broadcast and Internet video have certain requirements for video resolution, and the high-definition standard is very beneficial for publicity and effects. For example, the high-definition video capture cards launched by Wei Shi Image support the resolution of high-definition 1920x1440, and can automatically identify and adapt automatically under its resolution.

4. In addition, professional VGA capture cards are more expensive, and their performance is not as good as ordinary video capture cards. When buying a VGA capture card, you need to consider from your own perspective or the user's point of view, both to meet demand and save costs.