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some information about video formats
2007-04-14
as to the video converters , here is a passage about some information about video formats ,which I searched on web ,and want to share it with all of u. As we all know that video formats are classified into two applications, one for local use and the other for Internet. The formats for local use include AVI, nAVI, DV-AVI,MPEG suite, Dvix, MOV, etc. What the differences between these formats? I’m here to give some general information as a guide. AVI, Audio Video Interleaved, is developed by Microsoft in 1992. AVI has such advantages as high image quality, application in multi-platforms. But its disadvantages are also explicit, large volume, without a unified compression standard, and the most common nuisance is that the higher-version Windows Media Player simply can’t play AVI videos which are edited with earlier codes, and vise versa. So it is not a uncommon case that when we AVI videos , it just don’t work or anyway it works ,there is only audio without image or such kinds of weird problems. If you happen to be stuck with these tracks, download related codecs to cope. MPEG, Moving Picture Expert Group, is the format of VCD, SVCD, DVD. This format applies lossy compression to reduce redundant info in active images, and to express it more clearly, MPEG makes use of the fact that the two contiguous images are almost the same, to extrat the redundant info of the latter image ,as so to meet the compression aim( the highest compression reaches 200:1).At present, MPEG suite family members are MPEG-1,MPEG-2,MPEG-4.The other two MPEG-7 and MPEG-2 are right now under development. I