[Mp4-tech] Error concealment method: frame copy

[ashfiqua tahseen]

Hi,
  I want to know about the error concealment method of the decoder. In the frame copy concealment method, when a slice is lost, does it discard the whole frame and copies the previous reference frrame? I have read that prior to JM9.8, the concealment was on slice level i.e. in case of a lost slice, the slice was copied from the previous frame. But that version could not determine the picture loss. So now the JM uses frame copy. But does it replace slices when slice is lost or does it copy the whole frame even only one slice is lost? 
  I'll highly appreciate any suggestion.
  Regards,
  Ashfiqua
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