after_transcoding callback called too soon

[isuPatches]

I'm using the after_transcoding callback in a method of an uploader for a version of a video file:

def encode
    video = MiniExiftool.new(@file.path)

    aspect_ratio = video.imagewidth.to_f / video.imageheight.to_f
    encode_video(:mp4, resolution: "640x360", aspect: aspect_ratio, audio_codec: "aac", custom: "-strict -2 -b:a 32k", callbacks: { after_transcoding: :set_status })

    instance_variable_set(:@content_type, "video/mp4")
    :set_content_type_mp4
  end

  version :encoded_video do
    process :encode
  end

def set_content_type_mp4(*args)
    self.file.instance_variable_set(:@content_type, "video/mp4")
  end

that hits another method in a model to set a field:

def set_status(format, opts)
      self.update_column(:status, "active")
end

But the callback is being hit before transcoding is complete and the status field is active before the transcoding is complete.

I'm using:

carrierwave (~> 0.10.0)
carrierwave-video (0.5.6)
and ruby 2.2.3.