- Update to version 2.3
  Encoder enhancements
  * New SSIM-based RD-cost computation for improved visual quality,
    and efficiency; use --ssim-rd to exercise.
  * Multi-pass encoding can now share analysis information from
    prior passes.
  * A dedicated thread pool for lookahead can now be specified
    with --lookahead-threads.
  * option:–dynamic-rd dynamically increase analysis in areas
    where the bitrate is being capped by VBV; works for both
    CRF and ABR encodes with VBV settings.
  * The number of bits used to signal the delta-QP can be
    optimized with the --opt-cu-delta-qp option.
  * Experimental feature option:–aq-motion adds new QP offsets
    based on relative motion of a block with respect to the
    movement of the frame.
  API changes
  * Reconfigure API now supports signalling new scaling lists.
  * x265 application’s csv functionality now reports time
    (in milliseconds) taken to encode each frame.
  * --strict-cbr enables stricter bitrate adherence by adding
    filler bits when achieved bitrate is lower than the target.
  * --hdr can be used to ensure that max-cll and max-fall values
    are always signaled (even if 0,0).
  Bug fixes
  * Fixed scaling lists support for 4:4:4 videos.
  * Inconsistent output fix for --opt-qp-pss by removing last
    slice’s QP from cost calculation.
   Encoder enhancements

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