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May 24th, 2018
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  1. mplayer -af scaletempo -speed 0.5 input.mp4
  2.  
  3. ffmpeg -i input.mp4
  4. -filter_complex "[0:v]setpts=0.5*PTS[v];[0:a]atempo=2.0[a]"
  5. -map "[v]" -map "[a]"
  6. output.mp4
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