An MPEG2 compliant PSNR controller for a constant high quality studio enviorment

This paper proposes a new approach for the quality control of an Mpeg2 source. Actually the VBR coder is able to assure an average constant quality (namely less variable PSNR with respect to the CBR one) but it does not in a contribution application case, where the quality constraint plays an important role and a small variance of quality could be unacceptable. The reproduced quality is mostly relayed on the quantization parameters and we have studied how to control them to assure the same constant PSNR on each frame for a VBR-Mpeg2 profile 4:2:2 source.