JVET-AP0088 AHG9: On the QM SEI message [Y. He, S. Zhao, L. Kerofsky, M. Karczewicz (Qualcomm)]

This contribution proposes two alternative options to track the quality metric over multiple encoding stages or provide the source video quality for the decoder to assess the encoding quality indicated by the QM SEI message.

• Option 1, add text description to track the quality metric
• Option 2, signal the source CLVS or picture quality metric value of the current encoding system

v2 proposes to add sign syntax element to support negative metric gain value.

v3 modified the syntax elements proposed in Option 2

For option 1, it was noted that a text description is difficult to interpret.

For option 2, the proposed syntax allows signalling a source metric in addition to the quality metric of the coding. Both of these metrics are of the same metric type.

JVET-AP0179 is also related.

Further discussion requested on item 1.

Item 2 proposes adding a negative sign for the metric gain value.

Agreed to item 2.

JVET-AP0174 is related.

See notes under JVET-AP0139.

JVET-AP0088 AHG9: On the QM SEI message