Properties:
| Name | Value | Type | Description | 
|---|---|---|---|
KEEP | 
            
            
                keep | string | Never reset MediaSource when crossing boundary. | 
RESET | 
            
            
                reset | string | Always reset MediaSource when crossing boundary. | 
RESET_TO_ENCRYPTED | 
            
            
                reset_to_encrypted | string | Reset MediaSource once, when transitioning from a plain boundary to an encrypted boundary. |