Thank you for your kind hearted suggestions.i have referred to some related materials around my problems on the web and benefit a lot .here is a passage talked about the history of format -- Mpeg , i would like to enjoy it with friends here,
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To copy a video with up to 9 GB from a DVD to a CD-ROM requires a lot of computing power and time. After all the data volume must be reduced to about a 12th of its original size to accommodate the 700 MB of limited storage capacity of the CD-ROM. A data compression of this magnitude for digital video is only possible with the new video compression standard MPEG-4.
Generally speaking MPEG-4 is an extension of the MPEG-2 technology, but MPEG-4 can be used more universally. If you want to convert other video file format into MPEG，the
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The history of MPEG goes back to the year 1987. MPEG stands for Motion Pictures Expert Group, a worldwide organization that develops manufacturer and platform independent standards for video compression. The first result was introduced as MPEG-1 in 1992. It was the basis for the less successful European Video-CD. Because of its limited resolution of 352 x 288 pixels, MPEG-1 is only suitable for the home environment, and the achievable video quality in relation to the data rate is rather low from today's point of view.
MPEG-2 was introduced in 1995 and is mainly based on MPEG-1. The higher resolution with a maximum of 720 x 576 pixels is a major improvement enabling a significantly better video quality. The newest format is called MPEG-4 and was released by the MPEG group only recently in December 1999.
A movie sequence from a DVD generally comes in MPEG-2 format. This part is from the movie blockbuster "Matrix" and played back on the Mediaplayer.
This is the same video sequence in MPEG-4 format. Differences in quality are hardly noticeable, even though the data volume is only about 1/11 the size of the original MPEG-2 video.
MPEG-4 comes with a few important improvements compared to the older and established video compression technologies like MPEG-1 and MPEG-2
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Thank you Lovelystone
