I downloaded this free video app late last night. It allows you to mix photos and video and set the length of the final video. It then puts the movie together for you. You may also had text slides and music. The app also has several transitions. The videos retain their original sound , and the music you choose (If you do) plays over.
The cool part of this app is you may actually use “friends” photos and videos in your videos or even allow them to remix them.
The low points are that it takes forever to actually get your video done. I think since it is a new app, their servers get busy. Another low is that there are limited text slide editing possibilities. Both of these things will most likely be improved. with updates.
You may save to your photo roll or post to Face Book.