1, whether it supports hardware-level processing of video data is very important.
2, frame rate, this indicator is more important and specific. The frame rate directly affects whether the video file produced by the acquisition card is smooth or not. Generally, products with low frame rate have low grade and high CPU utilization rate. At present, the average mid-range video capture card can basically reach 352 *288 (PAL system), and the frame rate that can be recorded at this resolution can reach 25 frames per second. High-end products can reach 60 frames per second. For ordinary families, the dynamic resolution of MPEG I compressed by PAL system should reach 25 frames per second (NTSC system) and 30 frames per second when the resolution is 352 * 288.
3, resolution, we know that resolution is the main parameter of video file quality. Generally, the resolution of VCD is 352*288 (PAL system, 320*240 NTSC system), while the resolution of DVD is much higher, usually 704*480 30fps or 704*576 25fps. And the average user can't use such a high resolution. In addition, it should be noted that the resolution can be divided into static picture capture resolution and dynamic resolution. In general, the resolution of still picture capture is much higher than that of dynamic resolution, but it may not be indicated in product advertisements, and consumers may regard the resolution of still picture capture as dynamic resolution. Pay attention to distinguish this when buying.
Don't underestimate the audio input function. Without this function, we only collect images, and audio signals will be transmitted and recorded through the sound card, which will increase the occupancy rate of system resources when collecting video signals in real time, and it is easy to cause the synchronization of video and audio signals. Once this happens, there is often no room for correction. As for VCD production software, the more the better, the higher the VCD production software.
IV. Application Guide of Acquisition Card
1, the connection between acquisition card and digital video recorder. With the increasing popularity of digital video cameras, the requirements of film and television lovers for video production are also constantly improving. However, because video products are not very popular, many users will not only buy digital cameras, but also ask me what digital collection and editing cards I should have. In my opinion, what kind of graphics card to match should consider the following factors:
1) output mode:
If the final product is a DV video tape, you can choose a common 1394 interface card just by using the editing function of the graphics card. After editing by software, you can output it to DV video tape. If the final product is VCD or DVD, it is recommended that you use a video compression card with real-time hardware compression function, such as SuperVCD and SuperDVD. AV-800 and so on. Because a major feature of this card is that the hardware completes the compression process, it not only saves time (the compression time of 1: 1, the compression time of 1394 card is about 1:5), but also saves space (1 hour takes up 650 MB of hard disk space, 65438).
2) computer configuration:
Editing card is a bridge between digital camera and computer. Because 1394 card is edited by software, the data volume is huge (1 hour 17GB), so the requirements for hard disk and CPU are higher. If the computer configuration can't meet the higher requirements, it is more practical to use the real-time compression card, because the real-time compression card is used to edit compressed files (1 hour 650MB), and the requirements for hard disk and CPU are not very high.
3) Image quality requirements:
Generally speaking, exporting to DV video tape or making DVD will not cause much loss of image quality, but if exporting to VCD, the loss after image compression will be considered. Because the resolution of VCD is 352*288, which is only equivalent to the level of AV interface, there is little difference between the input image quality of DV interface and AV interface when making VCD, so general VCD compression cards do not have DV interface.
So how to choose a digital acquisition editing card for a digital camera? The author thinks that the popular digital editing cards on the market can be divided into two grades.
1)DV 1394 data card
This kind of product only transmits DV data recorded by digital camera to computer hard disk, and other functions such as editing and compression are realized by software. Generally, there is only 1394 data interface, which is a 1394 card suitable for home use. More popular are: peak StudioDV, SuperDV, AverDV and other products.
2) Editing card with 1394 interface
In addition to the functions of the above data cards, these products also have real-time editing functions. Adding subtitles and special effects are all done by hardware, and no generation time is needed, which is a nonlinear editing card in the usual sense. In addition to the 1394 interface, these cards are generally equipped with AV and S-Video interfaces. Products are MV 300, DC 30 PLUS and so on.
Tips: What is IEEE- 1394?
Apple called it FireWire, Sony called it i.Link and Texas Instruments called it Lynx. Although the registered trademarks of their respective manufacturers have different names, they are essentially a technology, that is, IEEE- 1394. As an open technical standard of data transmission, IEEE- 1394 has been applied in many fields. Of course, at present, IEEE- 1394 technology is the most widely used in the field of digital imaging, and its supported products include digital cameras or camcorders.
Attachment: Overview of Market Products
AVerMedia TV Genie can watch TV, video and VCD programs. Provide 75 ohm coaxial antenna and video /S terminal input, support PAL and NTSC systems, bilingual (SAP) stereo reception, support all channels (18 1 channel, which can receive supplementary channels) and comprehensive remote control function, switch TV/VIDEO/PC three video signals remotely, provide video output terminals, reserve TV recording, and automatically switch on and off the machine at regular intervals.
AVerMedia Joy TV can connect home entertainment devices such as video recorders, VCDs, camcorders and game consoles, and switch TV/video /PC signals at will through the remote controller. Provide rich functions such as booking TV videos, switching on and off time, and automatically scanning TV channels. This is a mainstream multifunctional TV receiver with fully intelligent design. AverMedia TV USB has composite and S-Video video input and audio input/output ports, integrated video capture chip and hardware image capture function. Whether it is TV programs or other video signals (cameras, VCDs, video recorders, cameras, etc. ) can be collected and stored in the hard disk, and then combined with video editing software, the personalized VCD tw 88 18E with the same dimension can be made, which supports plug and play, does not occupy computer resources, does not install software, and can be directly watched by connecting a monitor. Digital TV technology, high sensitivity reception and 24-bit 16M true color output make the signal reception quality meet the TV reception standard. Multi-standard, fully complementary TV signal reception, preset 90 TV channels.
TW882 1 I/II of the same size is designed in the form of optical drive, which can be installed on the 5.25 "optical drive bracket on the front panel of the computer case, and is integrated with the computer, which is beautiful and elegant and does not occupy additional space. The front panel is also provided with an audio/video input socket, which is convenient for users to plug in electricity and wires. It does not need software support and does not occupy computer system resources. Special design is adopted to make the signal receiving sensitivity reach the TV receiving standard. Full channel, full supplementary reception, all cable TV programs can be watched.
Galaxy Little King Kong entry-level VCD production card, collecting MPEG I format files, real-time hardware compression, burning VCD SUPER VCD popular VCD production card, Winond99200 chip, real-time hardware compression, audio and video synchronization MP 10 professional VCD production card, C-Cube chip, real-time/non-real-time compression, editing, subtitle generation, audio and video synchronization, good external parallel port compatibility;
Snazzidvc professional VCD production card, C-Cube chip, real-time hardware compression, external USB interface, with a variety of clip burning software.
=VICO professional VCD production card, Digital2 1230 chip, built-in audio and video output, can collect AVI, and support conversion to MPEG.
=AV-8 professional VCD production card, array Videoflow chip, real-time/non-real-time compression, built-in sound card, AVI, Premire support.
= Broadway professional VCD production card, Gao Bai chip, built-in, without sound function.
=MovieMaker top VCD production card, dual C-Cube chips, five-level filtering, three compression modes, single compression and pause recovery functions, and release-level effects.
=MovieMaker PLUS adds remote control function on the basis of xpress.
=MM2000DVD MovieMaker2000DVD, MPEG II compression, support network transmission, and publish DVD.
=AV-800 MPEG II compression, supporting miniDVD, unique pause function and SDK.
=Super DVD MPEG I/II compression, S-VIDEO, AV interface, SDK provided, making VCD/S-VCD/DVD/MINI-DVD.
=SNAZZI II MPEG II compression, you can do VCD, S-VCD, DVD, and the image is clearer.
=Navis MPEG II compression, which can support miniDVD and burn VCD on ordinary CD-R.
=MPEG DVR RealMagic chip, MPEG II hardware compressed playback, supports VOD, provides SDK Apollo 4 MPEG II compression, is used under NT, and supports VOD.
= Amber MPEG II compression, can be used under WIN98/NT, can preview, and the image is clear.
=FutureTEL NS320 supports SVCD, real-time network transmission, composite and S-video interface.
=FutureTEL NS325 MPEG II compression, supporting network transmission, publishing DVD production cards.
BUZZ MPEG-2 compression
=DV Link can make VCD and edit it with video studio.
=DV 200 professional DV editing card, editing and generating DV video tapes VCD and DVD, with DV tools, without SCSI interface.
=DV 300 professional DV editing card, editing and generating DV video tapes VCD and DVD with SCSI interface.
=DV 500 publishes DV editing card, with analog input and output, which can be connected to VCD production card, real-time lossless compression of VCD, two-dimensional editing and adding subtitles.
=RT 2000 publishes DV editing card with analog input and output, which can be connected to VCD production card, VCD real-time compression, two-dimensional editing and adding subtitles.
=DV RAX publishes a DV editing card with analog input and output, which can be connected to a VCD production card, VCD real-time compression, 3D editing and adding subtitles.
=DV@HOME high-speed IEEE 1394/ 1. Link DV interface, movie input and output are truly fully digital.
=Studio DV is a DV editing system based on PC, which is cheap, easy to learn and use.
=EZ DV is compatible with DV and Digital8 cameras, providing high-quality two-dimensional stunts.
=MV 300 popular clip card, the maximum compression ratio is 4: 1, no audio.
=DC 10 PLUS popular clip card, the maximum compression ratio is 3: 1, no audio, with its own clip software.
=DC 30 PLUS professional editing card, the maximum compression ratio is 2.5: 1, with audio, and the resolution is 786*576.
=DC 50 PLUS broadcast editing card, the maximum compression ratio is 2.2: 1, YUV component input and output, and the resolution is 720*576.
=DC 2000 broadcast editing card, maximum compression ratio 1.6: 1, YUV component input and output, two-dimensional real-time editing.
= Real-time broadcast editing card, maximum compression ratio 1.6: 1, YUV component input and output, two-dimensional real-time editing.
=DigisultLE broadcast editing card, YUV component input and output, two-dimensional real-time editing.
=DPS Velocity broadcast editing card, YUV component input and output, two-dimensional real-time editing.
=TARGA3000 broadcast editing card, YUV component input and output, two-dimensional real-time editing.