[Mp4-tech] [h.264]Regarding frame concealment technique

[Awadh Bihari Mohan]

Hi all,
  I am interested in the concealment techniques for partially lost frame. I am going through the decoder of the JM Reference Software but I am unable to get:
  1) How exactly the slice loss is detected at the decoder and how the macroblock map for the lost segment/slice is generated to perform the error concealment?
2) How the condition: 
img->mb_data[ i].ei_flag != img->mb_data[ i-1].ei_flag (Decoder, 
File:image.c, line 1236 in Reference software) indicates end of the 
lost segment.
  Any ideas/suggestions in this regard are welcome.
  Thanks and Regards,
  Awadh.
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