It must be mobile, if not then please don't mention it because it will be of no use to me.
I want to take a video I have and keep the sound. Then put pictures and videos over the sound at different times.
For example at 0:36 a picture of A comes up, then at 1:00 it switches to a video of B.
Read more: https://iphoneus.org/faq/is-there-an-iphone-app-for-putting-videos-pictures-over.html