Hello, mp3encoder! How are you?

  Video codecs (DivX) could encode VBR stream in multiple passes: on
  first pass it collect statistic about each frame, and on second
  pass. So, if after ``hard'' frame will be ``hardest'' frame, it will
  uses less bits for ``hard'' frame.

  MP3 encoder also have VBR/ABR mode. But it uses ``bit reservoir''.
  So, it use information only about PAST of signal.
  May be in some case will be useful to make 2-pass encoding? For
  example, (very rough example, of course), if second half of track is
  SILENCE, we could use DOUBLED average bitrate for first half. And
  now for first half will be used bitrate about average one.

               Lev Serebryakov
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