The Joint Collaborative Team on Video Coding (jct-vc) of itu-t wp3/16 and iso/iec jtc 1/ sc 29/ wg 11 held its tenth meeting during 11-20 July 2012 at the City Conference Centre (ccc), a k. a

5.9.2.8High level signalling

JCTVC-J0087 AHG6: Independent luma and chroma SAO on/off control at slice level [M. Zhou (TI)]

In the current HM7.0 design it is normatively restricted at the slice level that chroma SAO has to be turned off when luma SAO is off. Such a normative encoder restriction is undesirable because it restricts encoder flexibility. This contribution advocates removing such a restriction and making SAO on/off control flag fully independent at slice level. The proposed change does not affect coding efficiency.

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Only one slice per picture is used, therefore not surprising that there is no loss

HL signaling should be as simple as possible

Without the condition, extension to 4:4:4 is more straightforward

One expert said that the original intention of conditional parsing had been the support for fast encoding (but this is not completely obvious)

Several experts support the change. Decision: Adopt.