Commonly used video format conversion output Video format what

MPEG-1: Is the first video and audio lossy compression standard developed by the MPEG organization. The video compression algorithm was defined in 1990. At the end of 1992, MPEG-1 was formally approved as an international standard. MPEG-1 is a video and audio compression format that is customized for CD-ROM media. A 70-minute CD-ROM transfer rate is approximately 1.4Mbps. The MPEG-1 uses the technique of block-mode motion compensation, discrete-string transform (DCT), quantization, and optimizes the 1.2Mbps transmission rate. MPEG-1 is then used as a core technology by video CDs. The output quality of the MPEG-1 is approximately the same as that of a traditional VCR VCR, which may be the reason why video CDs have not been successful in developed countries.

MPEG-2: It is applied in the production of DVD (*.vob format file), but also in some HDTV high-definition TV broadcast) and some high-demand video editing, processing has considerable application. Using the MPEG-2 compression algorithm to make a 120-minute long movie (original video file) in the 4GB to 8GB size, of course, its image quality indicators are MPEG-1 incomparable.

MPEG-4: Published in November 1998, the original international standard MPEG4 is expected to be put into operation in January 1999 not only for video and audio coding at a certain bit rate, but also to focus on the interactivity and flexibility of multimedia systems. Experts from the MPEG Expert Group are working hard for MPEG-4. MPEG-4 standards are mainly used for video phones, video-based e-mail (video email) and electronic News (Electronic), which require low transmission rates, between 4800-64000bits/sec, The resolution is 176x144. MPEG-4 uses very narrow bandwidth to compress and transmit data with frame reconstruction techniques to obtain the best image quality with minimal data.

MPEG-7: The new members of this MPEG family are called "Multimedia content Description Interfaces" (Multimedia contents Description Interface), referred to as MPEG-7. The goal is to produce a standard that describes multimedia content data that meets the needs of real-time, non-real-time, and push-pull applications. MPEG is not standardized for applications, but it can be used to understand requirements and evaluate technology, which does not target specific application areas, but rather supports the widest possible range of applications.

DivX format: The most incisive word in the DivX format is: DVD killer. DivX Video coding technology can be said to be produced for the DVD, but it is to break the ASF constraints and developed. As mentioned above, it uses the MPEG-4 algorithm, so since the compression of a DVD only requires 2 vcd! this means that you do not need to buy a CD-ROM can also get the same video quality, and play this code, the machine is not high: CPU only More than 300MHZ, 64MB of memory and 4MB memory graphics card (believe that most of the machines are now eligible), you can play smoothly.

AVI format: English is all called Audio Video interleaved, that is, interleaved format. is the file format that combines voice and image synchronization. It uses a lossy compression method for video files, but the compression is high, so although the picture quality is not very good, but its application scope is still very wide. AVI supports 256 color and RLE compression. AVI information is mainly used in multimedia CD-ROM, to save TV, movies and other video information.

RM format: A streaming video file format developed by RealNetworks company, which can set different compression ratios according to different rates of network data transmission, so as to realize the real-time transmission and playback of video files on the internet with low rate. It mainly contains RealAudio, RealVideo, and Realflash three parts.

MOV format: The QuickTime movie format, an audio and video file format developed by Apple to store commonly used digital media types. When QuickTime (*.mov) is selected as the save type, the animation is saved as a. mov file.

ASF Format: is an abbreviation for (Advanced Streaming format), a streaming multimedia file format developed by Microsoft for Windows 98. ASF is at the heart of Microsoft's Windows Media. This is a data format that contains audio, video, images, and control command scripts. This term can now be used interchangeably with WMA and WMV.

WMV Format: A streaming media format introduced by Microsoft, which is an extension of the ASF (Advanced Stream format) format of "the same". In the same video quality, WMV format is very small, so it is suitable for online playback and transmission. AVI files encapsulate video and audio in a file, and allow audio to be synchronized to video playback. Similar to the DVD video format, AVI files support multiple video streams and audio streams.