Traditional Culture Encyclopedia - Photography and portraiture - About DV recording, video editing and combination, and burning to CD! Especially those from the Qingdao area must come!

About DV recording, video editing and combination, and burning to CD! Especially those from the Qingdao area must come!

The input/output interfaces of DV machines all have IEEE1394 interfaces. The IEEE1394 interface is also called the "FireWire" interface, and Sony calls it the i.LINK interface. Most people came into contact with the IEEE1394 interface because they had a DV machine. Now the IEEE1394 interface is more commonly called the DV interface.

IEEE1394 was originally a standard, a high-speed, short-distance data transmission and exchange protocol, formulated in 1986 by Michael Teener of Apple. IEEE (Institute of Electrical and Electronic Engineers) recognized it as IEEE1394-1995 specification in 1995. Because there are some vague definitions in IEEE1394-1995, devices with IEEE1394 interfaces were not common in the early years. Later, a document (Draft 1394a) was added to clarify, correct errors and improve efficiency. There are three data bit rates specified by the IEEE1394 standard: 98.304Mbps (S100), 196.608Mbps (S200), and 393.216Mbps (S400). The standard terminal of IEEE1394 is a 6-core interface with power supply. However, considering that if a handheld digital camera uses this terminal, the cable will be too thick and it will be inconvenient to use. Therefore, Sony first used a small 6-pin interface without power supply on small DVCAM equipment. 4-core 1394 interface. Later, IEEE1394 was recognized as a standard digital interface by the World Digital VCR (Video Recorder) Alliance, and as a digital transmission standard by the Digital Video Association. VESA (Video Experts Standards Association) recognizes 1394 for home video networks, and the European Digital Video Broadcasting (DVB) also recognizes IEEE1394 for digital TV interfaces.

The IEEE1394 bus is the fastest high-speed serial bus in computer technology so far, with a maximum transmission speed of 400Mbps/s. Like USB, it supports plug-and-play. The standard 1394 interface can transmit digital video signals and digital audio signals at the same time. Compared with analog video interfaces, 1394 technology does not cause any signal loss during the collection and playback process, so digital cameras It is to transfer the contents of the digital camera tape to the personal computer through the 1394 port, and then use various video editing software for image editing.

In the early days of the 1394 standard, because computer motherboard chip manufacturers could not directly provide support for the 1394 interface, they had to add additional control chips. Therefore, the external interface was 1394 on the market, and the internal interface was connected to the motherboard slot (PCI slot). The matching plug-in card is called a 1394 transmission card. In recent years, with the large number of digital products such as digital cameras being put on the market, the 1394 interface can be used to capture digital video very conveniently, which has brought a new dawn to 1394. Currently, there are more and more motherboards with built-in 1394 interfaces on the market. This greatly facilitates TV workers and DV enthusiasts. However, most existing computer motherboards still do not have a 1394 interface, so most users can only solve the problem by installing an additional 1394 card.

The 1394 card is an interface card that adopts the IEEE1394 standard. It is a data transmission card and can also be said to be an interface conversion card. It converts the external 1394 interface into one that matches the computer motherboard slot. Insert card. In fact, it does not have the function of video signal collection and is only equivalent to a data transmission interface. In fact, not only digital cameras in DV format, but also devices with 1394 interfaces, such as digital cameras, scanners, digital satellite receivers, etc., can be connected to computers through this 1394 card to transfer data to each other.

The advantage of using IEEE1394 is that you can copy between two DV devices through the 1394 input/output interface, and the copy will be exactly the same as the original. Users can also transmit video and audio signals directly from DV devices to NLE (non-linear editing) systems without loss.

There are many types and brands of 1394 cards on the market now. People often ask which card is better to buy and which card captures the highest image quality. In fact, all 1394 cards have very little difference in use (except for product quality issues). It can be said that the digital video signals collected by different l394 cards are exactly the same, because 1394 is a purely digital interface and will not cause signal loss. . Some people often judge the quality of 1394 cards due to low computer configurations, display image pauses, frame loss and mosaic phenomena caused by acquisition, and the quality of the final generated VCD, DVD and other video files to evaluate the quality of the 1394 card. This is actually a misunderstanding. Because the computer has a lot of computing work during the collection and editing process, it has high requirements on the CPU, memory, hard disk, etc. When these hardware configurations are low, it will form a bottleneck and cause data loss; while when compressing and generating VCD and DVD video files When encoding and decoding are implemented through software, the quality of the video is related to the software algorithm used and has nothing to do with the 1394 card.

Then why are the prices of 1394 cards of different brands and models so different? In fact, it is unrealistic to say that there is no difference between them at all, but their differences are more reflected in the control chips, components, production processes, included video editing software, and brand effects. In addition, some 1394 cards claim to be capable of real-time compression into VCD, DVD format files, etc. In fact, this is accomplished by the powerful computing power of computers and related video editing software. Do not believe such advertising. At present, the chips used in IEEE1394 cards in the domestic market are mainly produced by companies such as TI (Texas Instrument), Lucent, VIA (Vision Electronics), and SONY (Sony Corporation) in Taiwan Province of my country. The first three types of chips are relatively common. TI is the largest manufacturer of 1394 card chips, accounting for the largest market share and having the best compatibility. For most users, in order to reduce the trouble of installation and use, it is recommended to purchase a card using TI chips.

Due to the simple structure of the l394 card, low technical content, low production cost, and many manufacturers, there are various brands of 1394 cards currently on the market, and some do not even indicate the place of origin. There are indeed some differences. Some miscellaneous cards can be purchased for 40-50 yuan. Although the price is cheap, there is a big gap compared with well-known brands in terms of workmanship and materials. These cards may not have any impact in the short term, but as the use time increases, Quality problems of individual components may cause malfunctions or even scrapping. Therefore, the author suggests that you should not be too greedy for cheap, and it is best to buy brand-name products with relatively good workmanship, and the accessories that come with this product are also relatively complete and reliable.