ok, here’s what i remember:
it is from early 80’s and is a mix of segments of ‘real’ action and animation
the ‘real’ stuff is a story of after the apocalypse, a guy wearing breathing gear searches through a world full of rubble for oxygen cannisters.
the animation is a dark city with whalers hunting flying whales.
the main part however is a young character who has a ‘magical’ egg and is trying to protect it.
at the end the two overlap and the egg ends up with the ‘last man’ and it gives out oxygen = everything now ok.
i’ve tried googling but all it gives is hits for fantasia2000 which apparently has a flying whale in it?
cheers
nick