【 Weak current College 】 video format all interpretations

● AVI format: it's full name in English, that is, for AudioVideoInterleaved audio video interleaved format. It was in 1992, with the Microsoft company launched Windows3.1 was recognized and well known. The so-called "audio video interleaved", that is, you can set the video and audio are intertwined to synchronize playback. This video format has the advantage that the image quality is good, you can use across multiple platforms, the drawback is the size too large, but worse compression standard, and the most common phenomenon is the high version of Windows Media Player has not used the early coding edit AVI format video, while the lower version of Windows Media Player and play the latest coding edit AVI format video, so we make some AVI format video playback always appear as video encoding problems caused by the video can't play or even be able to play, but there will not be able to adjust the playback progress and playback only sound without images and some strange problems, if the user in the AVI format video playback are having these problems, you can download the appropriate codec.

● NAVI format: nAVI is an abbreviation that is newAVI named ShadowRealm underground organization developed a new video format (and we described above AVI format not much contact). It consists of modifying MicrosoftASF compression algorithm, but with the following introduction of network video video of ASF video format distinct from it at the expense of the existing ASF video files-video "streaming" property for the price and increasing the frame rate to substantially increase the clarity of the ASF video files.

● DV-AVI format: DV is the full name in English is from DigitalVideoFormat Sony, Panasonic, JVC and other manufacturers combined with a home digital video format. Currently very popular digital camera is the use of this format record video data. It can be done by the computer's IEEE1394 port to transfer data to computers, video or computer in the edited video data recorded back onto a digital camera. This kind of video format .avi file extension is generally, also called DV-AVI format.

● MPEG format: it's full name in English, that is, for MovingPictureExpertGroup moving picture experts group format, home often see VCD, SVCD, DVD is this format. MPEG file format is the moving image compression algorithm of international standards, it uses a lossy compression to reduce the redundancy in the moving image, say a little more aware of the MPEG compression method is based on the vast majority of the adjacent picture is the same, the follow-up to the previous image in the image are redundant part removal, so as to achieve the purpose of compression (its maximum compression ratio can reach up to 200: 1). Currently MPEG format has three compression standard, namely MPEG-1, MPEG-4 MPEG-2, and, Additionally, MPEG-7 and MPEG-21 still in development stage.

● MPEG-1: established in 1992, it is for the following data transfer rate of 1.5Mbps digital storage media campaign image and its associated audio coding and design by international standards. That is what we usually see VCD production format. Use MPEG-1 of compression algorithm, you can put a 120 minute long film about compression to 1.2GB. This kind of video format file extensions include .mpg, .mpeg, .mpe, .mlv and VCD .dat files on the disc.

● MPEG-2: established in 1994, the design goal for the advanced industrial standards of image quality and higher transfer rates. This format is mainly used in the production of DVD/SVCD (compression), while in some HDTV (high definition TV broadcasting) and some demanding video editing, processing, it also has considerable application. Using MPEG-2 compression algorithm, you can put a 120 minute long film down to size 4 to 8 GB. This kind of video format file extensions include .mpg, .mpe, .mpeg, .m2v and DVD .vob files, and so on.

● MPEG-3 (MPEGAUDIOLAYER3) is a high-compression of audio signals. Although itmusic signal compression ratio is higher, but still can and CD/MD of sound quality. MP3 up to 10: 1 compression ratio. Make a CD-R/RW can hold 10 tickets on regular CD of music. Reach can play music for a long time. You can from the Internet or other channels get MP3 format music.

● MPEG-4: established in 1998, is to play MPEG-4 streaming media of high quality designed specifically for video, it can be used to narrow band, through reconstruction technology, compression, and transmission of data, in order to use the least amount of data to get the best image quality. Currently MPEG-4 where the most attractive is its ability to save close to DVD quality for small video files. In addition, this file format also includes previous MPEG compression standard that does not have a bitrate of scalability, animation sprite, interactivity and even copyright protection and other special features. This kind of video format file extension including .asf, .mov and DivXAVI, etc.

Small Tip: careful users have noticed, this intermediate why no MPEG-3 encoding?, in fact, everyone is familiar with the MP3 is used MPEG-3 (MPEGLayeur3) encoding.

● DivX format: this is by MPEG-4 derived from another video encoding (compression) standard, which we commonly referred to as DVDrip format, it uses the MPEG4 compression algorithm and combines all aspects of MP3 MPEG-4 and technology, bluntly, is the use of DivX compression technology for video DVD disc image for high-quality compression, with MP3 or AC3 audio compression, and then the video and audio synthesis and coupled with appropriate external subtitle files into video format. Their picture quality presses DVD and volume only one of the few minutes of the DVD. This code on the machine's requirements are not high, so the DivX video encoding technology can be said to be a threat to the DVD's new video compression format, known as the killer DVD or DVD terminator.

● Apple MOV format: United States company developed avideo format, the default player is Apple's QuickTimePlayer. Has a high compression ratio and a perfect video sharpness, and other characteristics, but its best feature or cross-platform, that is, not only can support MacOS, also can support Windows series.
　　
● ASF format: its English name as it is Microsoft AdvancedStreamingformat to and now in RealPlayer competition launched a video format, users can directly use the Windows with WindowsMediaPlayer play it. Since it uses the MPEG-4 compression, compression and image quality are very good (high compression rate is conducive to the transfer of the video stream, but the image quality will be lost, so sometimes the ASF format picture quality not as good as VCD is normal).

● WMV format: its English name is also for WindowsMediaVideo Microsoft launched a separate encoding and can be viewed directly in Internet real time video compression format of the file. WMV format of the main advantages are: local or network playback, extensible media types, parts, download, scalable media type, flow's priority, multi-language support, environmental independence, abundant flow relationships and extensibility, and so on.

● RM format: RealNetworks company developed by audio video compression standard known as RealMedia, users can use RealPlayer or RealOnePlayer specification to conform to the RealMedia network audio/video resources to conduct live and RealMedia based on different network transfer rate to develop different compression ratios, resulting in a low rate of the network for image data transfer and playback in real time. This format of another feature is the user to use the RealPlayer or RealOnePlayer player you can not download audio/video content to achieve online play. In addition, RM as mainstream Web video format, it also makes the RealServer server will convert other video formats to RM video and RealServer server for external distribution and playback. RM and ASF formats can be said that each hashis merits, usually RM video softer, and ASF video is relatively clear.

● RMVB format: this is an upgrade from RM video format extends out of the new video format, its advanced in RMVB video format broke the original RM format that average compression sampling approach, to ensure an average compression ratio of rational use of resources, i.e. the bit rate at rest and action scenes less screen scene with a lower encoding rate, so you can spend more bandwidth space, bandwidth will appear fast moving picture the scene to be exploited. This ensures that a still picture quality, greatly improves the image quality of the moving image, the image quality and file size is reached between the delicate balance. In addition, relative to the DVDrip RMVB video format that also has a significant advantage, a size of about DVD movie 700MB, if its transcription into the same audio-visual quality RMVB format, their heads up that 400MB. Moreover, this kind of video format that also has a built-in caption and no plug-in plug-in support, and other unique advantages. If you want to play this kind of video format, you can use RealOnePlayer2.0 or RealPlayer8.0 plus RealVideo9.0 above version of decoder for playback in the form.

??? ● WAV format: is Microsoft's development of a sound file format, also called a wave sound file, is the oldest digital audio format, the Windows platform and application wide support. WAV format supports many compression algorithms, support for multiple audio bits, the sampling frequency and channel, using the sampling frequency, 44.1kHz 16 bit quantization bits, WAV sound comparable to the CD, but WAV format for storage space requirement is too large for easy sharing and dissemination.

??? • WMA format: full name is Microsoft WindowsMediaAudio, push with an audio format. WMA format is to reduce data traffic but maintain sound ways to achieve higher compression rate, its compression rate can reach 1: 18, the resulting file size is only halfof the MP3 file. It's only fitting models, 32M is very important to support the WMA and RA format, meaning that the space in virtually 32M expanded 2 times. In addition, you can also use DRM WMA (DigitalRightsManagement) programmes to prevent copying, or to limit the number of playing time and play, or even playing machine, can effectively prevent piracy.

??? ● 3GP format: is a 3G streaming media video encoding format, mainly in order to meet the 3 g network for high transmission speed and the development of, and is currently the most common mobile phone video format. At present, some OntarioEquipped with Realplay player Smartphone can directly play rm file suffix, so in the smart phone to enjoy some rm format video what is not natural. However, smart phone, after all, is one of the few, most of the mobile phone does not support rm format, if you want to achieve in these cell phone video playback you must adopt a 3GP video format. There are many available camera enabled mobile phones, shoot out of video files to 3GP is a suffix.