http://dd.weather.gc.ca/model_hrdps/continental/grib2/12/001/CMC_hrdps_continental_PRATE_SFC_0_ps2.5km_2017111712_P001-00.grib2 GRIB2 file with JPEG2000 codestream on a single line: https://trac.osgeo.org/gdal/ticket/6719