Hi JohnOldenburg,
Good day! This is Jhakesong an Independent Advisor and I will be happy to assist you with this.
If you are trying to play this video after importing it from your iphone and you got the error message it's possibly the app trying to play the video doesn't support it's codec. Try a third party video player. You can use VLC media player to play that file. You can get VLC from here:
https://www.videolan.org/vlc/index.html
Let me know how it goes. Have a great day!
Standard Disclaimer: These are links to non-Microsoft websites. The pages appear to be providing accurate, safe information. Watch out for ads on the sites that may advertise products often classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the sites before you decide to download and install it.