Jim Henson’s The Storyteller: 1x6

The Three Ravens

After using her powers to charm the widowed king into marrying her, an evil witch sees his children standing in the way of her power. She uncovers the children’s secret hiding place and turns the three princes into ravens. The ravens tell the princess she cannot speak a word for three years, three months and three days or they will remain forever as birds. From an early German folk tale.