Encoder

• Improve the tradeoffs for the random access mode across presets M1-M13: (!2120)
• Speeding up the higher quality presets by 30-40%
• Improving the BD-rate by 1-4% for the faster presets
• Improve the tradeoffs for the low delay mode for both screen content and non-screen content encoding modes (!2122, !2118)
• Add a toggle to remove the legacy one-frame buffer at the input of the pipeline allowing the low delay mode to operate at sub-frame processing latencies
• Add a new API allowing the user to specify quantization offsets for a region of interest per frame

Build, cleanup and bug fixes

• Various cleanups and functional bug fixes
• Fix the startup minigop size BD-rate loss
• Add ability to run the ci-testing offline