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  "mpng" writes a series of numbered movie frames to png files with
  the specified prefix.  If the "ray_trace_frames" variable is
  non-zero, these frames will be ray-traced.  This operation can take
  several hours for a long movie.

  Be sure to disable "cache_frames" when issuing this operation on a
  long movie (>100 frames) to avoid running out of memory.


  mpng prefix [, first [, last]]

  Options "first" and "last" can be used to specify an inclusive
  interval over which to render frames.  Thus, you can write a smart
  Python program that will automatically distribute rendering over a
  cluster of workstations.  If these options are left at zero, then
  the entire movie will be rendered.


   cmd.mpng( string prefix, int first=0, int last=0 )