The most commonly used video formats are: AVI format, DV-AVI format, MPEG format and DivX format. Among them, AVI format video can run on all Windows systems, DV-AVI format is a home digital video format, MPEG format is a cross-platform video format, and DivX format is a video encoding standard.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
1.AVI format
Its full English name is Audio Video Interleaved, which is the audio and video interleaved format. The file name ends with ".avi".
It was launched by Microsoft in 1992 and became known and well-known together with Windows 3.1. The so-called "audio video interleaving" means that video and audio can be intertwined for synchronous playback.
The advantage of this video format is that it has good image quality and can be used across multiple platforms. However, its disadvantage is that it is too large in size, and what is even worse is that the compression standards are not uniform, so it is often encountered in higher versions of Windows. Media players cannot play AVI format videos edited with earlier encodings, and older versions of Windows Media Player cannot play AVI format videos edited with the latest encodings.
2.DV-AVI format
The full English name of DV is Digital Video Format, which is a home-use format jointly proposed by Sony, Panasonic, JVC and other manufacturers. Digital video format. Currently very popular digital cameras use this format to record video data. It can transmit video data to the computer through the computer's IEEE
1394 port, and can also record video data edited in the computer back to the digital camera. The file extension of this video format is generally .avi, so we are accustomed to calling it DV-AVI format.
3.MPEG format
Its full English name is Moving Picture Expert Group, which is the Moving Picture Expert Group format. This is the VCD, SVCD, and DVD that are commonly seen at home. format. The MPEG file format is the international standard for moving image compression algorithms. It uses a lossy compression method to reduce redundant information in moving images.
The file name ends with ".mpg" or ".mpeg". MPEG is a cross-platform video format that can be played normally on basically all browsers.
The MPEG compression method goes more in-depth, which is to retain most of the same parts of two adjacent images, and remove the redundant parts of the subsequent image and the previous image, thereby achieving the purpose of compression.
Currently, the MPEG format has three compression standards, namely MPEG-1, MPEG-2, and MPEG-4. In addition, MPEG-7 and MPEG-21 are still in the research and development stage.
MPEG-1: Established in 1992, it is an international standard designed for digital storage media moving images and their accompanying audio coding with a data transmission rate below 1.5Mbps. That is the VCD production format we usually see. The file extensions of this video format include .mpg, .mlv, .mpe, .mpeg and .dat files in VCD discs, etc.
MPEG-2: Developed in 1994, the design goals are advanced industry standard image quality and higher transmission rates. This format is mainly used in DVD/SVCD production (compression). It is also widely used in some HDTV (high-definition television broadcasts) and some high-demand video editing and processing. File extensions for this video format include .mpg, .mpe, .mpeg, .m2v and .vob files on DVD discs.
MPEG-4: Developed in 1998, MPEG-4 is specially designed to play high-quality video for streaming media. It can use very narrow bandwidth to compress and transmit through frame reconstruction technology. data to obtain the best image quality using the least amount of data. The most attractive aspect of MPEG-4 is its ability to save small video files close to DVD quality. File extensions for this video format include .asf, .mov and DivX, AVI, etc.
4.DivX format
This is another video coding (compression) standard derived from MPEG-4, which is what we usually call the DVDrip format. , it uses the MPEG4 compression algorithm and combines various technologies of MPEG-4 and MP3. To put it bluntly, it uses DivX compression technology to compress the video images of DVD discs with high quality, and uses MP3 or AC3 to compress the audio. , and then synthesize the video and audio and add the corresponding external subtitle file to form a video format. Its picture quality is close to that of DVD and its size is only a fraction of that of DVD.
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