Old anime movie. White birds representing death
There are some similarities with Windaria


  The mountainous kingdom of Paro and the coastal city-state of Itha had been at peace for over a century. They would have remained that way but for the ambitions of Paro's power-hungry king. Paro invaded Itha, despite the love between Jill, Paro's prince, and Ahanas, Itha's princess. Caught between duty and emotion, the star-crossed lovers were forced to fight a war to its bitter conclusion. Isu was a simple farmer from the neutral village of Saki, but he saved Itha from being destroyed by a spy from Paro, and found himself hungering for wealth and glory that the Ithan monarchy could provide. Agents from Paro made him an offer to fulfill his wishes, and he left his wife Marin behind in what would turn into a battlefield between the two kingdoms.



As stated on its TVTropes page:


  In this story, the soul takes the form of a bird of red light, and flies off to a mysterious airship over the ocean.


Hence, there is the connection between bird and death, but the color of the birds doesn't match.
The final scene is similar to what you described. The main character felt that he had betrayed his own town by abandoning his fiancée. He regretted what he had done and decided to come back, but what he saw was only desolation. Eventually, he met his fiancée, but after a brief talk, he realized that she was only her ghost, who then took the form of a bird and flew away.
This can be the scene with a man and a woman talking: she killed him and then committed suicide.