[gdal-dev] Help requested: Concurrent read of a GeoTiff

[Even Rouault]

On jeudi 16 mars 2017 17:16:20 CET Grégory Bataille wrote:
> Hello all,
> 
> Reaching out to the community caused I have failed for the past few days.
> 
> *short version*, I'm trying to multithread the gdal2tiles utility, and I'm
> getting this
> 
> Generating Base Tiles:
> ERROR 1: LZWDecode:Wrong length of decoded string: data probably corrupted
> at scanline 256
> ERROR 1: TIFFReadEncodedTile() failed.
> ERROR 1:
> /Users/gbataille/Downloads/Project_58704_transparent_mosaic_group1.tif,
> band 1: IReadBlock failed at X offset 1, Y offset 0
> ERROR 1: GetBlockRef failed at X block offset 1, Y block offset 0
> ERROR 1: gba.vrt, band 1: IReadBlock failed at X offset 0, Y offset 0
> 
> Any idea?

Yes, you need one dataset object per thread . Dataset objects cannot be used 
simultaneously from several threads.

Even


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