[gdal-dev] Q: on gdalwarp of ecw file

[Even Rouault]

> 
> $ gdalwarp -t_srs EPSG:900913 -of ECW Saraji_South.ecw
> Saraji_South-900913.ecw                                    Output driver
> `ECW' not recognised or does not support
> direct output file creation.  The following format drivers are configured
> and support direct output:
> ...
> JP2ECW: ERDAS JPEG2000 (SDK 3.x)
> ...
> 
> but ECW is not in the list. Am I doing this wrong?

Nothing, but ECW does not support the Create() interface needed by gdalwarp. 
You could gdalwarp to a VRT file and then gdal_translate it into ECW

> 
> If I try this on my file:
> 
> ls -lh Saraji_South.ecw
> -rw-r--r-- 1 woodbri woodbri 220M 2012-12-17 10:47 Saraji_South.ecw
> 
> $ gdalwarp -t_srs EPSG:900913 -of JP2ECW Saraji_South.ecw
> Saraji_South-900913.jp2
> Creating output file that is 34551P x 32332L.
> Processing input file Saraji_South.ecw.
> 0ERROR 1: ECW SDK 500MB compress limit exceeded.
> ERROR 1: ECW SDK 500MB compress limit exceeded.
> ERROR 1: ECW SDK 500MB compress limit exceeded.
> ERROR 1: An error occured while writing a dirty block
> ERROR 1: Saraji_South-900913.jp2, band 2: An error occured while writing
> a dirty block
> ERROR 1: Saraji_South-900913.jp2, band 3: An error occured while writing
> a dirty block
> 
> ok, so this must mean the uncompressed file needs to be less than 500MB.

Yes, and using JP2ECW driver with .ecw extension probably confuses the driver 
on whether you want ECW or JPEG2000

> 
> Second problem, when I try to convert it to a tif it always dies like this:
> 
> $ gdalwarp -t_srs EPSG:900913 -of GTiff -co TILED=YES -co COMPRESS=JPEG
> -co PHOTOMETRIC=YCBCR Saraji_South.ecw Saraji_South-900913.tif
> Creating output file that is 34551P x 32332L.
> Processing input file Saraji_South.ecw.
> 0...10...20..ERROR 1: Could not perform Read/Write on file

Hum, did you check if you have enough disk space ?