Le mardi 14 juin 2011 16:49:58, Cole, Derek a écrit : Derek,
I'm not sure how you have implemented your multi-threading code, but you should never call the GDAL API on the same dataset/raster bands handle from several threads. This is true for all GDAL drivers. If you want to do multi-threading, you have to open a distinct dataset (possibly on the same file) for each thread. See http://gdal.org/gdal_8h.html#e97be045eb4701183ad332ffce29745b Best regards, Even > Sorry to spam the list, but I am wondering if this is related to the > threading perhaps? I have tried to run this identical code in a > single-threaded fashion, and it seems to work OK. Does the library perhaps > have something going on that is signaling the file has been read > prematurely? I have watchers that are waiting on a finished signal, which > I have tested that they are (and this works for a non-compressed image). > Most of the image tiles are coming back zeros, which makes me think it is > somehow initializing some memory, and signaling it is done before the > arrays have actually been populated? > > Derek > ________________________________ > From: gdal-dev-boun...@lists.osgeo.org [gdal-dev-boun...@lists.osgeo.org] > on behalf of Cole, Derek [dc...@integrity-apps.com] Sent: Tuesday, June > 14, 2011 10:28 AM > To: Chaitanya kumar CH > Cc: gdal-dev@lists.osgeo.org > Subject: RE: [gdal-dev] OpenJPEG2000 issues when reading blocks at a time > > I am afraid I won't be able to post a screenshot, or the original image > that is causing this issue. > > I will also note, occaisionally the image fails to load at all, and I get a > dump like this: > > ERROR 1: Marker is not compliant with its position > > ERROR 1: opj_read_header() failed > ERROR 1: IReadBlock failed at X offset 1, Y offset 0 > ERROR 1: GetBlockRef failed at X block offset 1, Y block offset 0 > Segmentation Fault > > > Googling for those error message reveals about 2 results, and this email > thread is one of them =\ ________________________________ > From: Chaitanya kumar CH [chaitanya...@gmail.com] > Sent: Monday, June 13, 2011 11:13 PM > To: Cole, Derek > Cc: gdal-dev@lists.osgeo.org > Subject: Re: [gdal-dev] OpenJPEG2000 issues when reading blocks at a time > > Derek, > > Can you provide a screenshot of the displayed image. Especially the > scrambled blocks. _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
