id summary reporter owner description type status priority milestone component version severity resolution keywords cc 3139 Assertion `!sp->cinfo.comm.is_decompressor' in r17637 timlinux warmerdam "I'm trying to build pyramids / overviews on a vrt dataset but I get an assertion error each time. e.g. {{{ gdaladdo --config COMPRESS_OVERVIEW JPEG --config PHOTOMETRIC_OVERVIEW YCBCR --config INTERLEAVE_OVERVIEW PIXEL mosaic.vrt 2 4 8 16 0...10...20...30...40...gdaladdo: tif_jpeg.c:691: JPEGPreDecode: Assertion `sp->cinfo.comm.is_decompressor' failed }}} or {{{ gdaladdo --config COMPRESS_OVERVIEW JPEG --config INTERLEAVE_OVERVIEW PIXEL mosaic.vrt 2 4 8 16 0gdaladdo: tif_jpeg.c:1299: JPEGPreEncode: Assertion `!sp->cinfo.comm.is_decompressor' failed. Aborted (core dumped) }}} This seems to be similar symptoms to closed bug #2033 This issue was encountered with svn trunk r17637 I have in the past successfully built overviews on vrt datasets so I am guessing the activity itself is supported. Tim" defect closed normal GDAL_Raster svn-trunk normal invalid gtiff