• first IDR per default at POC31 instead of POC0 to align with other GOPs
• improved RC, especially for high rates and low activity scenes, especially for HDR
• enabled spatial sub-sampling for 2pRC in preset faster
• number of MCTF references adaptively increased
• reduced the efficiency gap for dependent frame parallelism (still experimental, as not harmonized with RC)
• around 0.5% BDR gains for all presets
• many other minor cleanups and changes