How many video formats are there in mobile phones?

MPEG/MPG/DAT\x0d\MPEG (Moving Picture Expert Group) is short for Moving Picture Expert Group. This format includes MPEG- 1, MPEG-2, MPEG-4 and other video formats. MPEG- 1 is considered to be the most widely used, because it is widely used in VCD production and some video clip download network applications. Most VCDs are compressed in MPEG- 1 format (the recording software will automatically convert MPEG- 1 to DAT format). Using the compression algorithm of MPEG- 1, 10 can be compressed. MPEG-2 is used in DVD production, and also widely used in some HDTV (High Definition Television Broadcasting) and some demanding video editing processes. A movie with a length of 120 minutes can be compressed to a size of 5-8 GB by using the compression algorithm of MPEG-2 (the picture quality of MPEG-2 is incomparable to that of MPEG- 1). MPEG series standards have become the most influential multimedia technical standards in the world, among which MPEG- 1 and MPEG-2 are the first generation data compression coding technologies based on the same principles, such as predictive coding, transform coding, entropy coding and motion compensation. MPEG-4(ISO/IEC 14496) is an international standard based on the second generation compression coding technology. It takes audio-visual media objects as the basic unit and adopts content-based compression coding to realize the integration of digital audio-visual and graphic synthesis applications and interactive multimedia. MPEG series standards have great influence on VCD, DVD and other audio-visual consumer electronics, digital TV and HDTV (DTV&; & The development of information industry such as HDTV and multimedia communication has had a great and far-reaching impact. \x0d\\x0d\ video format \x0d\AVI\x0d\AVI, which is short for audio-video interleaving. AVI is a video format released by Microsoft, and it is one of the oldest formats in the video field. AVI format is convenient to call, the image quality is good, and the compression standard can be selected at will. It is one of the most widely used and longest-lasting formats. \x0d\MOV\x0d\ Friends who have used Macs should be exposed to QuickTime. QuickTime was originally Apple's image and video processing software for Mac computers. Quick-Time provides two standard image and digital video formats, that is, it can support static *. PIC and *. JPG image format, dynamic *. MOV based on Indeo compression method and *. MPG video format based on MPEG compression method. \ x0d \ ASF \ x0d \ ASF (advanced streaming format). ASF is a file compression format developed by Microsoft to compete with Real player, which can watch video programs directly on the Internet. ASF adopts MPEG4-4 compression algorithm, and the compression rate and image quality are very good. Because ASF exists in a video "streaming" format that can be watched instantly on the Internet, it is not surprising that its picture quality is worse than that of VCD, but it is better than that of RAM format which is also a video "streaming" format. \x0d\WMV\x0d\ is a technical standard for real-time multimedia transmission on the Internet independent of coding mode. Microsoft hopes to use it to replace technical standards such as QuickTime and file extensions such as WAV and AVI. The main advantages of WMV are: extensible media types, local or network playback, extensible media types, streaming priority, multilingual support, scalability and so on. \x0d\NAVI\x0d\ If you find that the original playback software suddenly can't open the AVI file in this format, then you should consider whether you have met NAVI. N AVI is the abbreviation of the new AVI, which is a new video format developed by an underground organization called Shadow Kingdom. It is a modification of Microsoft ASF compression algorithm (not the imagined AVI), and the video format pursues nothing more than compression rate and image quality, so NAVI improves some shortcomings of the original ASF format in order to pursue this goal, so that NAVI can have a higher frame rate. It can be said that NAVI is an improved ASF format without the characteristics of video streaming. \x0d\3GP\x0d\3GP is a video coding format of 3G streaming media, which is mainly developed to meet the high transmission speed of 3G network and is also the most common video format in mobile phones at present. \x0d\ Simply put, this format is a multimedia standard formulated by 3rd generation partnership project (3GPP), which enables users to enjoy high-quality multimedia content such as video and audio on their mobile phones. Its core consists of advanced audio coding (AAC), adaptive multi-rate coding (AMR), MPEG-4 and H.263 video codec. At present, most mobile phones that support video shooting support video playback in 3GPP format. Its characteristic is low network speed, but poor image quality. \ x0d \ realvideo \ x0d \ realvideo (ra, RAM) format is located in the application of video streaming from the beginning, and it can also be said that it is the originator of video streaming technology. It can realize uninterrupted video playback under the condition of using 56K modem to dial up the Internet. Of course, compared with MPEG2 and DIVX, its image quality is not satisfactory. After all, it takes a lot of bandwidth to transmit uninterrupted video on the Internet, which is a strong competitor of ASF. \x0d\MKV\x0d\ Video files with the suffix MKV often appear on the network. It can integrate multiple different types of audio tracks and subtitle tracks in one file, and the degree of freedom of video coding is also very great, which can be common streaming media videos such as DivX, XviD, 3IVX, and even RealVideo, QuickTime, WMV, etc. In fact, it is a new multimedia packaging format called Matroska. This advanced and open packaging form shows us a very good application prospect. \x0d\FLV\x0d\FLV is short for FLASH VIDEO, and FLV streaming media format is a new video format. Because the file it forms is extremely small and the loading speed is extremely fast, it is possible to watch video files on the network. Its appearance effectively solves the shortcomings that the exported SWF file is huge after the video file is imported into Flash and cannot be used well on the network. \ x0d \ F4V \ x0d \ F4V, as a smaller and clearer format, has gradually replaced the traditional FLV, and most mainstream players play it without complicated ways such as conversion. F4V is a F4V streaming media format supported by H.264, which was introduced by Adobe to meet the high-definition era. The main difference between FLV and FLV is that the FLV format adopts H263 encoding, while F4V supports H.264 encoded HD video with a maximum bit rate of 50Mbps. That is to say, F4V and FLV can achieve higher resolution and support higher code rate under the premise of the same volume, which is what we call clearer and smoother. In addition, the suffix of F4V files downloaded by many mainstream media websites is FLV, which is another feature of F4V format and is a normal phenomenon. When you look at it, you can clearly feel that this is actually the FLV of F4V, and its clarity and fluency are obviously higher. \x0d\RMVB\x0d\RMVB was formerly in RM format. They are audio and video compression specifications formulated by real networks. According to different network transmission rates, different compression ratios are set to realize real-time transmission and playback of image data on low-rate networks, which has the advantages of small size and good image quality. \x0d\ The early RM format was developed to realize video play online with limited bandwidth, which once swept the whole Internet. In order to achieve better volume and image quality, Real Networks soon introduced RMVB format with variable bit rate coding based on RM. The birth of RMVB broke the way of average compressed sampling under the original RM format. On the basis of ensuring the average compression ratio, the floating bit rate coding method is adopted, and a higher bit rate is adopted for complex dynamic pictures (such as singing and dancing, flying cars, wars, etc.). ), and flexibly change it to a lower sampling rate in the static picture, so as to make rational use of bit rate resources and make RMVB minimize the size of the film, and finally have a nearly perfect audio-visual effect close to DVD quality. We can make a simple comparison. Generally speaking, the size of a 120-minute dvd is 4GB, but it is only about 400MB compressed in rmvb format, and the clarity and fluency are not much worse than the original DVD. \x0d\ In order to shorten the downloading time of video files in the network and save the valuable space capacity of users' computer hard disks, more and more videos are pressed into RMVB format and widely circulated. Up to now, more than 80% of the video files in every computer user's computer (maybe including you who are reading this article) will be in RMVB format. \x0d\RMVB has become the most widely used video format in PC at present because of its own advantages, but in MP4 players, RMVB format has been ignored for a long time. In the seven years of MP4 development, although AVI format has been perfectly supported a long time ago, a model fully compatible with RMVB format has not been born for a long time. For MP4, especially flash MP4 with small capacity and low price, what kind of video format will be its mainstream in the future? We might as well discuss it. \x0d\WebM\x0d\[ 1] is an open and free media file format proposed by Google. WebM movie format is actually a new container format based on Matroska (MKV) container format, which includes VP8 movie track and Ogg Vorbis audio track. Among them, Google authorized its own VP8 video coding technology to be open source similar to BSD, and Ogg Vorbis was originally an open format. WebM standard network video is more open source, based on HTML5 standard. The WebM project aims to develop a high-quality and open video format for the network open to everyone, with the focus on solving the core network user experience of video services. Google said that the format of WebM is quite efficient and should be able to be used smoothly on netbooks, tablets and handheld devices.