Extracts the object managing the streaming thread from @message.
Return: a GValue containing the object that manages the streaming thread.
This object is usually of type GstTask but other types can be added in the
future. The object remains valid as long as @message is valid.
Extracts the object managing the streaming thread from @message.
Return: a GValue containing the object that manages the streaming thread. This object is usually of type GstTask but other types can be added in the future. The object remains valid as long as @message is valid.