Video Info Viewer is an open source app that allows you to view metadata about videos on your iOS devices. You can view the atom structure of the MPEG-4 file format, and inspect resolution, frame rate, and more.
Video Info Viewer is released under the Apache License, Version 2.0. See LICENSE.md.
In the App Store: https://itunes.apple.com/us/app/video-info-viewer/id1152619802
Also available for Android: https://github.com/hoolrory/VideoInfoViewer-Android