To provide a helpful response, I will assume you are referring to the third season, second episode of the BBC television series "Shetland", and "BDMV" might stand for a video file format ( likely referring to a Blu-ray Disc Movie file or similar).
If you see Shetland S03E02 BDMV available on a private tracker or Usenet indexer, you are looking at the definitive version of the episode. It is the raw negative of digital television. shetland s03e02 bdmv