If you have multiple videos in a row, there might be a chance that your videos are proportionately of different height. And if so, they will display in different height as the Divi sets the video to be 100% width (of the column) and 100% height proportionate automatically.
So in the case that you want the videos to be of same height, here’s what to do.
1) Create thumbnail images for the videos
2) Add css that fix the height of your video thumbnails
max-height: 130px !important;
height: 130px !important;
3) Add css that fix the height of your video
Done. Try it out and see if it works for you. Cheers.