24. audio&video file format
The mainly used formats for videos are MPEG1(also referred to as vcd),MPEG2(used by DVD),MPEG(DVDIP uses its variations as divx ,xvid,etc.)and MPEG4 AVC( very hot now); For audio format ,MPEG Audio Layer 1/2,MPED Audio Layer3( that’s mp3),MPED-2 AAC,MPEG-4 AAC etc. Attention: MPEG is not applied for DVD audio. The audio/video container for MPEG, has a streaming attribute. It can be further classified into PS,TS, used respectively as a container for DVD and HDTV .
It seems that more and more people come to wonder about the many formats of audio and video. This curiosity arose for certain reasons. As you know ,3G mobiles are upgraded with each passing day , portable gadgets such as PDA are quite on the way to ubiquity, and necessarily accompanied by the enhancement of bandwidth, some ABCs about audio and video become a must. Since if you are lost about what kind of format your gadget supports, problems will dog you.
A standard audio format for Windows operating systems, often used for storing high-quality, uncompressed sound. WAV files can contain CD-quality (44.1 KHz/16-bit) audio signals. However, CD-quality WAV files require relatively large amounts of memory — roughly 10 MB per minute of music. MPEG stands for Moving Picture Experts Group — a committee that sets international standards for the digital encoding of movies and sound. There are several audio/video formats which bear this group's name.
MPEG is the dominant file format used to create VCD, SVCD and DVD. This high quality compressed format can be used across all platforms. VCD, SVCD and DVDs accept MPEG files that conform to their respective standards. MPEG files differ in many parameters that characterizes the MPEG format. A container format allows you to combine different multimedia streams (most of the time audio and video) into one single file.