Encoder
Improve the tradeoffs for the random access mode across presets:
Speedup CRF presets M6 to M0 by 17-53% while maintaining similar quality levels
Re-adjust CRF presets M7 to M13 for better quality with BD-rate gains ranging from 1-4%
Improve the quality and speed of the 1-pass VBR mode
Improve Multi Pass VBR algorithm for better quality with BD-rate gains of ~3% on average
More details on the per preset improvements can be found in MR !2143
Add API allowing to update bitrate / CRF and Key_frame placement during the encoding session for CBR lowdelay mode and CRF Random Access mode
ARM Neon SIMD optimizations for most critical kernels allowing for a 4.5-8x fps speedup vs the c implementation
Cleanup and bug fixes and documentation
Various cleanups and functional bug fixes
Update the documentation for preset options and individual features