[gdal-dev] GDAL 3.4.2: gdalbuildvrt band selection bug

[Even Rouault]

Pete,

ouch, confirmed, and fix queued in 
https://github.com/OSGeo/gdal/pull/5547 . And the commit you mention was 
indeed the culprit.

Potential workarounds (besides generating the VRT on GDAL <= 3.4.0)

- if using gdalbuildvrt on a single source, you could just use 
"gdal_translate sen2_20210527_aber_subset.kea test.vrt -b 2", that will 
do the job equally well

- if using multiple sources, you could also use gdal_translate with band 
selection on the VRT generated by gdalbuildvrt (without band selection) 
to extract only the band(s) you're interested in, but obviously that 
creates one more file

(do not hesitate to file an issue in github for obvious regressions like 
that. emails tend to be easily forgotten)

Even

Le 30/03/2022 à 12:59, Pete Bunting via gdal-dev a écrit :
> Hi,
>
> With the release of gdal 3.4.2, gdalbuildvrt seems to have a bug when selecting image bands. It works OK when band 1 is specified but if other band(s) in the image are used without band 1 then it seg faults. I noticed there were some changes around checking bands in the release notes "change logic to check homogenous number of bands” and I had a quick look at the commits but cannot see where this is occurring.
>
> # Works:
> gdalbuildvrt test.vrt sen2_20210527_aber_subset.kea -b 1
>
> # Seg Faults:
> gdalbuildvrt test.vrt sen2_20210527_aber_subset.kea -b 2
>
> ERROR 5: sen2_20210527_aber_subset.kea: GDALDataset::GetRasterBand(2) - Illegal band #
> Segmentation fault (core dumped)
>
>
> # Works:
> gdalbuildvrt test.vrt sen2_20210527_aber_subset.kea -b 1 -b 2 -b 3
>
> # Seg Faults:
> gdalbuildvrt test.vrt sen2_20210527_aber_subset.kea -b 2 -b 3 -b 4
>
> ERROR 5: sen2_20210527_aber_subset.kea: GDALDataset::GetRasterBand(4) - Illegal band #
> Segmentation fault (core dumped)
>
> Note, the input image I was using has 10 bands and these commands work with 3.4.1. I get the same seg fault on Mac, Linux and Windows ("Windows fatal exception: access violation").
>
> Many thanks,
>
> Pete
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