Size = bitrate x duration.

ballpark for standard def videos is from 500Kbps to 2Mbps for HD videos from 2 Mbps up to 5 Mbps.

You’re trying to reference a value that was never created. If you get this while referencing a property of another object, you’re probably trying to access a property that is not defined as a public member of that object’s class. If you get this error in response to a value that you’ve defined within the script that you’re writing, then you probably forgot to declare the value with a “var” statement before its first reference.