vipthumbnail doesn't work with certain files

[testn]

When I use vipthumbnails to generate thumbnails, it fails for certain files
http://imgur.com/a/WqAKy
http://commons.wikimedia.org/wiki/File:Waterfalls_in_Tomboy,_Colorado.jpg
http://upload.wikimedia.org/wikipedia/commons/9/97/Azoren_%2814%29.jpg

with the exception like:
VipsFormat: file "Waterfalls_in_Tomboy%2C_Colorado.jpg" not a known format

while some other JPEGs, give out the warning like
vips warning: VipsJpeg: unknown JFIF resolution unit
but it seems to work fine

[jcupitt]

I tried on this image:

http://upload.wikimedia.org/wikipedia/commons/f/fa/Waterfalls_in_Tomboy%2C_Colorado.jpg

$ md5sum Waterfalls_in_Tomboy,_Colorado.jpg 
537505fb22173c0caf2ae7d3c7e2a4b5  Waterfalls_in_Tomboy,_Colorado.jpg

and it seems to work here. I tried:

$ for i in {1..100}; do vipsthumbnail Waterfalls_in_Tomboy,_Colorado.jpg; done

with git master and with 7.30 and all seemed OK.

Could it be a filename problem? Should the %2C in your filename be a ',' character?

[testn]

You're right. It looks like my script to pull images didn't work correctly with %