fix exif metadata containing wrong keys and datetime with binary character

fix_broken_exif.sh

fn="$1"
echo "fn: $fn"
[ -f "$fn" ] || exit 1
str="$(exiv2 -p a "$fn" 2>&1 | grep -a Exif.Image.DateTime | grep -a -o '2019:.*$')"
#echo "'$str'"
# fix datatime first
exiv2 -M"set Exif.Image.DateTime $str" "$fn"
# extract all readable metadata (to .xmp file)
exiv2 -eaX "$fn"
# delete all metadata
exiv2 rm "$fn"
# restore metadata from file
exiv2 -iaX "$fn"