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Bugfix for JVET-Q0172

Peter Chuang requested to merge peterchuang/VVCSoftware_VTM:Bugfix_of_Q0172 into master

Bugfix of JVETQ0172 (Disallow differing chroma format and different bit depths for cross-layer prediction) and bugfix of setting inter_layer_ref_pics_present_flag and constraint (When vps_independent_layer_flag[ GeneralLayerIdx[ nuh_layer_id ] ] is equal to 1, the value of inter_layer_ref_pics_present_flag shall be equal to 0.)

  1. Solve the issue raised in !1322 (comment 10231)
  2. Fix the inter_layer_ref_pics_present_flag value setting and corresponding bitstream constraint. The encoder will crash without this fix if multi-layer structure is applied.
Edited by Karsten Suehring

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