Video (subtitles layer?) interface

Hello friends,
I am in need for a code that would read specific keyframes in a 5min video and would tranlate them to a signal change in 3 analog Arduino outputs.

I don't want it to fade etc, just to change 5,6,9 outputs each time at once.

Thanks in advance, kobi.

too little information to give any meaningful advice

what does a keyframe looks like?
where does they come from?
must it be real time?
what is translating in the context of your application
The Arduino has no analog outputs

do you have some idea how to program an Arduino?
do you have any idea of the limits of an Arduino?

BTW there are different Arduino's with different capabilities, which did you have in mind?