I am fairly sure that this film is not in the English language. I think it was French, but perhaps not. It was low budget, perhaps 1970s.
Right at the start it shows a confusing series of blurry shots, with a red wash, suggestive of the controls of a spacecraft. Then it shows a big splash - intended to be the spacecraft crashing in the ocean (but clearly something like a stick of dynamite thrown from the beach - it was low budget). A man crawls onto the beach.
The only high tech prop is a ring. It is worn by the space traveler as a survival device. It can move him forward in time but not backward in time. He is searching for a time when the Earth technology becomes advanced enough that he can build a spacecraft and go home. He seems to be in South America. He meets what might be conquistadors, and is strung upside down on a wooden frame by them. He pretends to bribe one of the guards with his ring. It won't come off. He says to twist it - which sends him through time.
Several trips later, he meets a girl. He likes her. She wants to come with him through time. He wonders whether holding onto her when he twists the ring will bring her too. It does, but she is immediately shot, as he has landed in a modern war zone. Sad at the death he twists the ring again - but this time the camera does not follow him. End of movie.