Video Capture card is also called the video card, is the analog camera, video recorder, LD player, TV output video signal output of the video data or audio and video data is input to the computer, the computer can identify and converted into digital data, stored in the computer, can be processed video data file editor. According to its use can be divided into broadcast video capture card, professional grade video capture cards, commercial video capture card.
Video capture card is also called a video capture card, it can be used to obtain the digitized video information, and the storage and playback. A lot of video capture card can capture video information and audio, the audio portion and a portion of the video synchronization in digital preservation, synchronous playback.
Video capture card," Video Capture Card", its function is to make the video signal acquisition to the computer, in the form of data files stored in the hard disk. It is our video processing essential hardware equipment, through it, we can put the camera video signal from the camera to take onto the computer, using the related video editing software, the digital video signal processing, such as editing, add filtering ytterbium, shear picture captions and audio, set the deployment effect and adding various video effects and so on, finally will complete the editing of a video signal is converted into a standard VCD, DVD and stream media format, convenient communication.
Classification
Video capture card according to the video signal source, can be divided into data acquisition card ( using a digital interface ) and analog capture card.
Video capture card according to the installation of links, can be divided into external acquisition card ( box ) and a built-in card.
Video capture card according to the video compression, can be divided into soft press card ( consume CPU resources ) and hard press card.
Video capture card in accordance with the video signal input and output interface, can be divided into 1394 acquisition card, USB card, HDMI card, VGA video capture cards, video cards, PCI PCI-E video acquisition card.
Video capture card according to their performance, can be divided into the TV card, image acquisition card, DV card, computer video card, monitoring data acquisition card, multi-screen card, streaming media data acquisition card, component acquisition card, HD acquisition card, notebook acquisition card, DVR card, VCD card, non-linear editing card ( referred to as the NLE card ).
Video capture card in accordance with its use can be divided into the broadcast video capture card, professional grade video capture cards, commercial video capture card, their grade level is mainly the acquisition of image quality in different. The difference between them is the main index of different image acquisition.
Video image acquisition method is more, basically can be divided into 2 categories: digital signal and the analog signal acquisition. So the common image acquisition card also has a digital acquisition card and simulation acquisition card, AV+DV combo acquisition card types.
Broadcast video acquisition card with the highest acquisition resolution for general 768X576 ( RMS) for PAL, or 720X576 ( CCIR-601 ) PAL 25 frames per second, or 640X480 / 720X480 NTSC for 30 frames per second minimum compression is usually in the ratio of 4: 1. This type of product is characterized by the acquisition of high resolution images, video signal to noise ratio, disadvantage is the video file is huge, the minute data volume of at least 200MB.
Professional grade video capture card level than the broadcast video capture card performance slightly lower resolution, the two are the same, but the compression ratio is slightly larger, the minimum compression is usually in the ratio of 6: 1, input and output interfaces for AV composite terminal and S terminal.
Commercial video acquisition card dynamic resolution is typically a maximum of 384X288, PAL 25 frames per second.
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