-  Update to version 2.2
   Encode enhancements
   * Enhancements to TU selection algorithm with early-outs for
     improved speed; use --limit-tu to exercise.
   * New motion search method SEA (Successive Elimination Algorithm)
     supported now as :option: –me 4
   * Bit-stream optimizations to improve fields in PPS and SPS for
     bit-rate savings through --no-opt-qp-pps, 
     --no-opt-ref-list-length-pps, and --no-multi-pass-opt-rps.
   * Enabled using VBV constraints when encoding without WPP.
   * All param options dumped in SEI packet in bitstream when info
     selected.
   API changes
   * Options to disable SEI and optional-VUI messages from bitstream
     made more descriptive.
   * New option --scenecut-bias to enable controlling bias to mark
     scene-cuts via cli.
   * Support mono and mono16 color spaces for y4m input.
   * --min-cu-size of 64 no-longer supported for reasons of
     visual quality.
   * API for CSV now expects version string for better integration
     of x265 into other applications.
   Bug fixes
   * Several fixes to slice-based encoding.
   * --log2-max-poc-lsb‘s range limited according to HEVC spec.
   * Restrict MVs to within legal boundaries when encoding.

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