I haven't tried to burn a dvd from the command line, so I can't help you with that.
In k3b, I've had nothing but failures resulting from clicking on the Burn dvd icon.
On the other hand, I've had nothing but success if I go to the Tools menu, and click on Burn DVD, then drag and drop the iso onto the bottom panel, then click on Burn.
Just a thought. Hope it helps you.
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