if live_media configuration items are specified in the conf file, how do i generate a live-cd iso?
The live-media phase can create an ISO that works as a live CD. It's how Fedora does it (until it gets replaced by kiwibuild). The phase will trigger tasks in a configured Koji instance (selected by koji_profile option).
koji_profile
There is no ability in Pungi to generate live ISOs directly. It always delegates to another tool running inside a Koji task.
If you want to create the images without Koji, Pungi can't help. I'd recommend checking out kiwi:
This issue has been migrated to Fedora Forge: https://forge.fedoraproject.org/pungi/pungi/issues/1785
Please continue any further discussion there.