One thing I notice right off the bat is, IOS has almost no customization compared to Android. It seems that with Apple they tell you how you can use your phone. And with Android its a lot more freedom in what you can do with your phone. Well see how things go. I have 14 days to try and see if I like the Iphone IOS camp.
ffmpeg -i input.mkv -c:v copy -ac 2 -c:a libfdk_aac -vbr 4 output.mp4