create a video out of the existing one with a different frame rate

I have two signals that were taken together for 15 minutes and suppose to be perfectly synced, one is a video taken in 30Hz and the other is an EEG signal taken in 1200Hz.

After the aquisition I saw that they are not synced and that the video is 15:09 long. I think that there was an error in the frame rate of the camera and that it aquired the video at 30.3Hz but it doesn't know that so it shows it as if it was longer. This causes a delay between the two signals that is getting bigger as time goes on.

I want to create a new video out of the existing one that will be synced to my EEG signal and save it.

How should I do it?