here is what i have used before:

texture {
  pigment {
    image_map {
      jpeg concat(str(frame_number,-8,0),".jpg")  // ("00000001.jpg", etc)
      map_type 0
      interpolate 2
      once
    }
    translate <-0.5,-0.5,0>   // center background
  }
}

Jaap.

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