How to use gdal utilities to subset from a raster?
gdal_translate
gdal_translate -projwin ulx uly lrx lry inraster.tif outraster.tif`
Or
gdal_translate -srcwin xoff yoff xsize ysize inraster.tif outraster.tif
-projwin ulx uly lrx lry
: Selects a subwindow from the source image for copying with the corners given in georeferenced coordinates.
-srcwin xoff yoff xsize ysize
: Selects a subwindow from the source image for copying based on pixel/line location.
EDIT: Can you subset a region from a vrt ?
gdal_translate -projwin ulx uly lrx lry inraster.vrt outraster.tif
gdal_translate -of VRT -projwin ulx uly lrx lry inraster.tif outraster.vrt