I cannot mount a DVD, most probably because it is blank, so it contains no filesystem.
Is there a way to be sure that the disk is blank?
This worked for me on Ubuntu 18.04 Bionic, may need to be tweaked for others:
alias dstat='/lib/udev/cdrom_id -d /dev/dvd 2>&1 | /bin/grep status'
⏵ dstat
hardware reported media status: blank
Call cdrecord -v -minfo.
If you have more than one CD/DVD/BluRay drive, you need to specify a dev= parameter.
NOTE: the option -minfo (media info) has been introduced 12 years ago, so you need to use a halfway recent cdrecord version to be able to use that option.
See man pages:
http://cdrtools.sourceforge.net/private/man/cdrecord/index.html
A recent version is here: http://sourceforge.net/projects/schilytools/files/ today, the version 2018-12-06 is recent. Just unpack the tar archive and call make inside at top level.
-minfo that means media info, while -msinfo means multi session info. BTW: You are not using cdrecord, but a fake command that implements the development state from May 2004.