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MPEG(Moving Picture Ex-perts Group)专家组继成功定义了MPEG-1和MPEG-2之后,于1993年7月开始制订全新的MPEG-4标准,并分别于1999年初和2000年初正式公市了版本1和版本2。到2001年10月,MPEG-4已定义了19个视像类(Visual Profile),其中新定义的简单演播室类(SimpleStudio Profile)和核心演播室类(Core Studio Profile)使MPEG-4对MPEG-2类别保留了一些形式上
Following the successful definition of MPEG-1 and MPEG-2, MPEG (Moving Picture Ex-perts Group) Group of Experts began to make the new MPEG-4 standard in July 1993 and officially went public in early 1999 and early 2000 respectively Version 1 and version 2. As of October 2001, MPEG-4 has defined 19 Visual Profiles, with the newly defined SimpleStudio Profile and Core Studio Profile enabling MPEG-4 to MPEG The -2 category retains some formality