Video data stream comprising a sequence of slice portions , each slice portion having encoded thereinto a respective slice of a plurality of slices of a picture of a video , wherein each slice portion comprises a slice address indicating a location where, in a picture area of the video, the slice is located which the respective slice portion has encoded thereinto; characterised by further comprising; extraction information indicating how to extract from the video data stream a reduced video data stream having encoded thereinto a spatially smaller video corresponding to a spatial section of the video by confining the video data stream to slice portions having encoded thereinto any slice within the spatial section and amending the slice address of said slice portions having encoded thereinto any slice within the spatial section so as to relate to a decreased picture area of the spatially smaller video , the extraction information comprising a first information defining the spatial section within the picture area, wherein none of the plurality of slices crosses borders of the spatial section ; and a second information signalling explicitly in form of substitute slice addresses as to how to amend the slice address of the slice portion of each slice within the spatial section so as to indicate, within the reduced video data stream , the location where, in the decreased picture area, the respective slice is located. a sequence of slice portions , each slice portion having encoded thereinto a respective slice of a plurality of slices of a picture of a video , wherein each slice portion comprises a slice address indicating a location where, in a picture area of the video, the slice is located which the respective slice portion has encoded thereinto; characterised by further comprising; extraction information indicating how to extract from the video data stream a reduced video data stream having encoded thereinto a spatially smaller video corresponding to a spatial section of the video by confining the video data stream to slice portions having encoded thereinto any slice within the spatial section and amending the slice address of said slice portions having encoded thereinto any slice within the spatial section so as to relate to a decreased picture area of the spatially smaller video , the extraction information comprising a first information defining the spatial section within the picture area, wherein none of the plurality of slices crosses borders of the spatial section ; and a second information signalling explicitly in form of substitute slice addresses as to how to amend the slice address of the slice portion of each slice within the spatial section so as to indicate, within the reduced video data stream , the location where, in the decreased picture area, the respective slice is located. a first information defining the spatial section within the picture area, wherein none of the plurality of slices crosses borders of the spatial section ; and a second information signalling explicitly in form of substitute slice addresses as to how to amend the slice address of the slice portion of each slice within the spatial section so as to indicate, within the reduced video data stream , the location where, in the decreased picture area, the respective slice is located. <EOS>