[gdal-dev] Re: GDAL custom build (ECW required)

[Gilles Bassière]

Frank Warmerdam wrote:
> Gilles Bassière wrote:
>>> with COMPRESS=JPEG:
>>>
>>>  Creating output file that is 10000P x 10000L.
>>>  Processing input file ortho-dept04-2004-la2e.vrt.
>>>  0...10...20...30..gdalwarp: tif_jpeg.c:691: JPEGPreDecode: Assertion
>>> `sp->cinfo.comm.is_decompressor' failed.
>>>  Aborted
> 
> Gilles,
> 
> The likely solution to this problem is to build GDAL with
> the internal copy of libtiff.  I have fixed a variety of
> bugs related to random read/write support in libtiff on
> compressed images and some of those fixes have not yet made
> it out into distributions copy of libtiff.
> 
>> The largest image has a black gap in the middle instead of the actual
>> data. The smaller image doesn't show this gap and prove that there is
>> actually data in the input dataset.
> 
> I suspect black gaps would be due to a problem introduced in
> GDAL warp for 1.7.x and only recently fixed.  I would suggest you
> build GDAL from either a stable or trunk snapshot so you will
> have the fix for this problem with will also appear in 1.7.2 when
> it is released.
> 
>> Could this be due to wrong values read in the ECW input files?
> 
> While I've had lots of problems with ecw over the years, I don't
> see any obvious sign it relates to the ecw side of things.
> 
> Best regards,

Frank,

I've compiled the svn-stable daily snapshot and used
--with-libtiff=internal. It seems to solve my problem. I don't see
anymore black area and the Tiff/JPEG driver doesn't throw any error.

Thanks you very much

-- 
Gilles Bassière - Web/GIS software engineer
http://gbassiere.free.fr/