Comment # 1 on bug 929435 from Bernhard Wiedemann

We already have automatic size checks using a value from
https://github.com/os-autoinst/os-autoinst-distri-opensuse/blob/master/templates#L2771

which translates to
4700372992/1024/1024/1024
=> 4.3775634 GiB

and the larger of our 13.2 DVDs has
-rw-r--r-- 1 root root 4678746112 Oct 30  2014 openSUSE-13.2-DVD-x86_64.iso

4678746112/1024/1024/1024
=> 4.357421875

so I wonder why you cannot get this on your "4.7 GB" disk with "4.399GB"... 

would be interesting how much actually fits on it, but as I see it,
either the disk does not comply to DVD+-R standards
or you are doing something wrong (like putting the iso into another
filesystem).

Can you please try this to burn the ISO file:
growisofs -dvd-compat -Z /dev/sr0=/path/to/iso_file