Abstract
Multimedia content transcoding technologies have become more important than before for efficient content delivery in a wide variety of network and storage environment. In this paper, we discuss recent fast and high quality transocding techniques including coding bit rate conversion, spatial and temporal resolution conversion and coding format conversion for MPEG coded contents. As for the coding bit rate conversion, we show that a fast conversion can be realized through re-quantization process. When resolution conversion and/or coding format conversion are involved, we discuss a variety of studies to realize efficient transcoding by avoiding a computationally complex tasks such as motion estimation through the active use of coding information of input coded data.
