I said it before and I'll say it again... pre-credit sequence where Martha and Jonathan are driving in Smallville, ship crashes, they find the craft, and bring the baby home. They name him Clark. Roll credits. Start movie with adult Clark arriving in Metropolis. The rest of the stuff, like where he came from, is revealed throughout the plot of the movie. 10 minutes max.
Superman's origin is so simple, that you can absolutely have an origin movie and it not take up an hour of screentime.