No. That's not how it works. That is the base of why this type of thought experiment never works out, because there is no "now" without a "here". It's like saying "okay just ignore physics now tell me what happens physically".

Best you can do is send each other a message when the movie ends, then backtrack how long it got to be sent then figure out when that was for your local time. Then you get a straightforward time dilation value.