A capture card, also known as a video capture card, uses it to capture digitized video information, store it, and play it out. Many video capture cards can acquire audio while capturing video information, allowing the audio and video sections to be simultaneously saved and synchronized when digitized.
Video capture card, "VideoCaptureCard", its function is to capture the video signal to the computer, save it as a data file on the hard disk. It is an indispensable hardware device for video processing. Through it, we can transfer the video signal taken by the camera from the camera tape to the computer, and use the relevant video editing software to perform post-editing on the digitized video signal. Processing, such as cutting pictures, adding filters, subtitles and sound effects, setting transition effects, and adding various video effects, etc., and finally converting the edited video signals into standard VCD, DVD, and online streaming media formats, etc. Spread from the interface of the video signal source and the acquisition card, video capture cards are divided into two categories: one is an analog capture card, and the other is a digital capture card.
The analog capture card captures the analog video signal into the PC through the AV or S terminal, and converts the analog signal into a digital signal. The video signal source can be from analog cameras, television signals, analog video recorders, and the like.
Digital acquisition card through the IEEE1394 digital interface, in the form of digital to digital, digital video signal losslessly collected to the PC, the video signal source mainly from the DV (digital video camera) and other digital devices.
An important difference between the analog capture card and the digital capture card is that using a digital capture card, the video signal is not lost during the capture process, and the same effect as the original video source can be ensured. However, if the analog capture card is used, the video signal will have a certain degree of Loss. Someone once made an analogy analogously: analog capture is similar to using video recorders to turn video tapes. Ribbed subbands are always inferior to master tapes. If subbands are used for ripping, the effect will be even worse. Digital capture is like using a computer to copy. Like data files, no matter how many times you copy, the copied files are exactly the same as the original files, and there is no difference. Two-in-one capture card, refers to the digital analog capture card, AV + DV capture card. Digital input and output, analog interface input (DV/AV/S-video), full interface card.
The acquisition card is also called a video capture card. According to its use, it can be divided into broadcast video capture cards, professional video capture cards and civil video capture cards. The difference between them is mainly that the collected image indicators are different. The highest capture resolution of a broadcast video capture card is generally 768x576 (root mean square) PAL, or 720x576 (CCIR-601) PAL 25 frames per second, or 640X480/720X480NTSC system 30 frames per second minimum compression ratio is generally within 4:1. This type of product is characterized by high resolution of the captured image and high video signal to noise ratio. The disadvantage is that the video file is huge, and the data amount per minute is at least 200 MB. Broadcast-level analog signal acquisition cards have component input/output interfaces for connecting to BetaCam cameras/recorders. These devices are the highest-end video capture cards for TV stations to produce programs. The level of professional-grade video capture card is slightly lower than that of broadcast-grade video capture card. The resolution is the same, but the compression ratio is slightly larger. The minimum compression ratio is generally within 6:1, and the input/output interface is AV. Composite terminals and S-terminals, these products are suitable for advertising companies, multimedia companies to produce programs and multimedia software. The dynamic resolution of the civilian-level video capture card is generally 384X288 maximum, PAL 25 frames per second. In addition, there is a special type of video capture card that is special. This is the VCD production card. It should be regarded as a professional grade in terms of usage. In terms of image indicators, he can only count as a civilian-level product.
Since the LED display is a special display medium, it cannot directly accept computer data and needs a series of transformations.
The function of the capture card is to collect the display data of a high-speed computer (or multimedia display card), convert it, and down-convert it to the main controller. When no video tape, VCD or other video images need to be played, the capture card can be directly used. Connected to a computer display card.
On the computer, the video capture card can receive the analog video signal from the video input. The signal is collected, quantized into a digital signal, and then compressed into a digital video. Most video cards have the function of hardware compression. When the video signal is collected, the video signal is first compressed on the card, and then the compressed video data is sent to the host through the PCI interface. The general PC video capture card uses the intra-frame compression algorithm to store the digitized video as an AVI file. Some high-end video capture cards can also directly compress the collected digital video data into MPEG-1 format files.
Since the analog video input can provide an uninterrupted source of information, the video capture card captures each frame of the video in the analog video sequence and passes the data to the PC system before acquiring the next frame of the image. Therefore, the key to achieving real-time acquisition is the processing time required for each frame. If the processing time of each frame of the video image exceeds the interval between two adjacent frames, data loss occurs, ie, a frame dropping phenomenon. The acquisition card first compresses the acquired video sequence and then stores it in the hard disk, which means that the acquisition and compression of the video sequence are completed together, eliminating the inconvenience of performing compression processing again. Different grades of acquisition cards have different quality acquisition and compression performance.
Video capture card, "VideoCaptureCard", its function is to capture the video signal to the computer, save it as a data file on the hard disk. It is an indispensable hardware device for video processing. Through it, we can transfer the video signal taken by the camera from the camera tape to the computer, and use the relevant video editing software to perform post-editing on the digitized video signal. Processing, such as cutting pictures, adding filters, subtitles and sound effects, setting transition effects, and adding various video effects, etc., and finally converting the edited video signals into standard VCD, DVD, and online streaming media formats, etc. Spread from the interface of the video signal source and the acquisition card, video capture cards are divided into two categories: one is an analog capture card, and the other is a digital capture card.
The analog capture card captures the analog video signal into the PC through the AV or S terminal, and converts the analog signal into a digital signal. The video signal source can be from analog cameras, television signals, analog video recorders, and the like.
Digital acquisition card through the IEEE1394 digital interface, in the form of digital to digital, digital video signal losslessly collected to the PC, the video signal source mainly from the DV (digital video camera) and other digital devices.
An important difference between the analog capture card and the digital capture card is that using a digital capture card, the video signal is not lost during the capture process, and the same effect as the original video source can be ensured. However, if the analog capture card is used, the video signal will have a certain degree of Loss. Someone once made an analogy analogously: analog capture is similar to using video recorders to turn video tapes. Ribbed subbands are always inferior to master tapes. If subbands are used for ripping, the effect will be even worse. Digital capture is like using a computer to copy. Like data files, no matter how many times you copy, the copied files are exactly the same as the original files, and there is no difference. Two-in-one capture card, refers to the digital analog capture card, AV + DV capture card. Digital input and output, analog interface input (DV/AV/S-video), full interface card.
The acquisition card is also called a video capture card. According to its use, it can be divided into broadcast video capture cards, professional video capture cards and civil video capture cards. The difference between them is mainly that the collected image indicators are different. The highest capture resolution of a broadcast video capture card is generally 768x576 (root mean square) PAL, or 720x576 (CCIR-601) PAL 25 frames per second, or 640X480/720X480NTSC system 30 frames per second minimum compression ratio is generally within 4:1. This type of product is characterized by high resolution of the captured image and high video signal to noise ratio. The disadvantage is that the video file is huge, and the data amount per minute is at least 200 MB. Broadcast-level analog signal acquisition cards have component input/output interfaces for connecting to BetaCam cameras/recorders. These devices are the highest-end video capture cards for TV stations to produce programs. The level of professional-grade video capture card is slightly lower than that of broadcast-grade video capture card. The resolution is the same, but the compression ratio is slightly larger. The minimum compression ratio is generally within 6:1, and the input/output interface is AV. Composite terminals and S-terminals, these products are suitable for advertising companies, multimedia companies to produce programs and multimedia software. The dynamic resolution of the civilian-level video capture card is generally 384X288 maximum, PAL 25 frames per second. In addition, there is a special type of video capture card that is special. This is the VCD production card. It should be regarded as a professional grade in terms of usage. In terms of image indicators, he can only count as a civilian-level product.
Since the LED display is a special display medium, it cannot directly accept computer data and needs a series of transformations.
The function of the capture card is to collect the display data of a high-speed computer (or multimedia display card), convert it, and down-convert it to the main controller. When no video tape, VCD or other video images need to be played, the capture card can be directly used. Connected to a computer display card.
On the computer, the video capture card can receive the analog video signal from the video input. The signal is collected, quantized into a digital signal, and then compressed into a digital video. Most video cards have the function of hardware compression. When the video signal is collected, the video signal is first compressed on the card, and then the compressed video data is sent to the host through the PCI interface. The general PC video capture card uses the intra-frame compression algorithm to store the digitized video as an AVI file. Some high-end video capture cards can also directly compress the collected digital video data into MPEG-1 format files.
Since the analog video input can provide an uninterrupted source of information, the video capture card captures each frame of the video in the analog video sequence and passes the data to the PC system before acquiring the next frame of the image. Therefore, the key to achieving real-time acquisition is the processing time required for each frame. If the processing time of each frame of the video image exceeds the interval between two adjacent frames, data loss occurs, ie, a frame dropping phenomenon. The acquisition card first compresses the acquired video sequence and then stores it in the hard disk, which means that the acquisition and compression of the video sequence are completed together, eliminating the inconvenience of performing compression processing again. Different grades of acquisition cards have different quality acquisition and compression performance.
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