[gdal-dev] Problems generating a COG file

[Even Rouault]

Hum, it would be useful if you could subset the input file to the 
minimum needed to reproduce the error and (possibly privately) share it 
to me.

Even

Le 20/08/2025 à 23:36, Javier Jimenez Shaw a écrit :
> Right. it fails
>
> $ gdal_translate web_mercator.tif web_mercator_jpeg.tif -co 
> COMPRESS=JPEG -co BIGTIFF=YES -of GTIFF -co TILED=YES -co 
> BLOCKXSIZE=512 -co BLOCKYSIZE=512 -oo NUM_THREADS=ALL_CPUS
> Input file size is 677881, 303664
> 0..                              - estimated remaining time: 
> 00:31:20ERROR 1: LZWDecode:Not enough data at scanline 0 (short 2 bytes)
>
> But if I change -oo with -co, it fails somewhere else:
>
> $ gdal_translate web_mercator.tif web_mercator_jpeg_co.tif -co 
> COMPRESS=JPEG -co BIGTIFF=YES -of GTIFF -co TILED=YES -co 
> BLOCKXSIZE=512 -co BLOCKYSIZE=512 -co NUM_THREADS=ALL_CPUS
> Input file size is 677881, 303664
> 0...10...                                            - estimated 
> remaining time: 00:10:55ERROR 1: web_mercator.tif:Using code not yet 
> in table
> ERROR 1: TIFFReadEncodedTile() failed.
> ERROR 1: web_mercator.tif, band 1: IReadBlock failed at X offset 2570, 
> Y offset 216: TIFFReadEncodedTile() failed.
>
>
> On Wed, 20 Aug 2025 at 22:43, Even Rouault 
> <even.rouault at spatialys.com> wrote:
>
>
>>
>>     Can I do other useful tests tonight?
>
>     Maybe just check/confirm that the issue is multithreading on the
>     decoding side (which it looks to be) with:
>
>     gdal_translate web_mercator.tif web_mercator_jpeg.tif -co
>     COMPRESS=JPEG -co BIGTIFF=YES -of GTIFF -co TILED=YES -co
>     BLOCKXSIZE=512 -co BLOCKYSIZE=512 -oo NUM_THREADS=ALL_CPUS
>
>     where web_mercator.tif is LZW or Deflate compressed
>
>
>     -- 
>     http://www.spatialys.com
>     My software is free, but my time generally not.
>
-- 
http://www.spatialys.com
My software is free, but my time generally not.
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