Playing audio on betpad2 and video on apple TV

Hi, with my Djay pro I succeded once to play audio thru betpad2 (the controler I mostly use) while playing video on airplay (apple TV).
I really need this feature because It’s the only way to use video feature for promotion while mixing.
Since this time I never succeded again in playing music and video on different devices.
Any idea to achieve this?
Regards.