I have one folder with 30 videos, and another with 4. I want to merge the 30 first video as an intro to the 4, in order to create 120 different videos. In other words, imagine letters are intro videos and numbers the base video.
Folder 1: A, B, C ...
Folder 2: 1, 2, 3, 4
Output: A1, A2, A3, B1, B2, B3, C1, C2, C3 ...
How can I do this? Thank you!