[Mp4-tech] HDTV and SDTV MPEG Decoders

[Prashant Desai]

Hello all 
    is HDTV and SDTV decoders for MPEG-2  or MPEG-4 AVC  are same   ?  
    i think both are different so  to support   one HDTV channel   MPEG-2 and Two  SDTV channel of  [ one of MPEG-2   and one of MPEG-4 AVC ]  , it required a STB having total 3 decoders supporting   [ one decoder for MPEG-2 HDTV ,  one Decoders of MPEG-4 AVC SDTV and one decoder of MPEG-2 SDTV  ]   so total 3 independent decoders ?  
  Please correct me if my understanding on the same is wrong 
regards,
Prashant Desai 
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