Dreaming about being an actress and filming a scene where you are stabbed can be quite symbolic. Here are some interpretations of the various elements in your dream:

1. Acting and Performance: Being an actress may symbolize your desire for self-expression or a role you play in your waking life. It might reflect how you present yourself to others, or perhaps there's a situation where you feel you need to "perform" rather than be your true self.
2. Violence and Stabbing: The act of being stabbed can represent feelings of vulnerability or fear of being hurt emotionally or physically. It may signify a situation in your life where you feel attacked or betrayed. However, since you mentioned it didn't hurt, this might suggest that you have a level of detachment or resilience regarding these feelings.
3. Repetition of the Scene: Filming the scene multiple times could indicate that you are processing a traumatic experience or a situation that feels cyclical. It may also suggest a need to refine how you handle challenging circumstances in your life.
4. Perspective: Viewing the scene through a security camera and then from your own point of view suggests a duality in how you perceive events. It may indicate that you are analyzing your life from an objective standpoint while also being deeply involved in your experiences.

Overall, this dream could reflect a complex blend of self-exploration, emotional processing, and the need to evaluate how you cope with pain or conflict in your life. Consider what aspects of your life might feel like a performance or where you may be feeling vulnerable. It could be beneficial to reflect on these themes and how they relate to your current circumstances.