[FFmpeg-trac] #4584(undetermined:new): Add POWER altivec support to FFmepg external library x265

[FFmpeg]

#4584: Add POWER altivec support to FFmepg external library x265
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             Reporter:  rongyan      |                     Type:  task
               Status:  new          |                 Priority:  important
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 Summary of the feature request / enhancement:
 The x265 is a very important external library. There is no SIMD
 optimization, neither altivec nor assembler, on POWER platform. It makes
 the performance of x265 encoder much lower on POWER platform.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4584>
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