[Gdal-dev] Re: gdal fails on vrt (virtual raster) file

[Frank Warmerdam]

WolfgangZ wrote:
> I will try tomorrow to convert these data on my linux machine (with 
> FWTools) again. Furthermore I will try a "gdal_translate -of JPEG 
> input.jpg out.jpg" on all tiles to get non progressive jpgs (hopefully).
> At least a more clear error would be nice to get a better hint where the 
> error is. Would it also be possible to add to gdalinfo which compression 
> is used (ie tiff has several possibilities (JPEG, LZW,...) and jpeg has 
> a progressive and nonprogressive mode). I would suggest a --verbose mode 
> for gdalinfo.
> 
> Thanks for your help so far!

Wolfgang,

A lot of the error handling involved here is deep in libjpeg and so I think
it is hard for GDAL to provide detailed diagnostics.

It would be nice for the JPEG driver to indicate if a given file is
progressive or not.  This could be returned as IMAGE_STRUCTURE domain
metadata and then it would be reported by gdalinfo.  Patches welcome.

Best regards,
-- 
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | President OSGeo, http://osgeo.org