Encoder bug when min QT size is 128 and intra dual tree off

[guichunli]

Current VTM-8 encoder skips all intra mode checking when CU is larger than 64x64. As in the following code of EncModeCtrl.cpp:

if( m_pcEncCfg->getUseFastLCTU() && partitioner.currArea().lumaSize().area() > 4096 )
{

return false;

}

In special case such as when min QT is 128, and intra dual tree is off, intra mode should be checked for such CUs if no further split is allowed.

[guichunli]

A MR with a fix is submitted:
​https://vcgit.hhi.fraunhofer.de/jvet/VVCSoftware_VTM/-/merge_requests/1486

[guichunli]

Configuration file that triggers the bug

[guichunli]

Attached a configuration file that can trigger this bug on the current master of VTM software.