That when bit-rate reduction is used in HDTV studios, the bit-rate reduction factor usedshould be sufficiently small to provide virtually transparent (quasi-lossless) coding both in terms ofthe subjective quality of stationary and moving pictures, and in terms of picture post-processabilityin the studio.
ITU-R BT.1199-1-2010 history
2010ITU-R BT.1199-1-2010 Use of bit-rate reduction in the HDTV studio environment