Video should be shot in landscape mode. Look at that giant TV in your living room. Head down the movie theater and check out the silver screen. Both are in landscape and now, finally, Twitter's live video-streaming app Periscope will support the correct orientation on iPhone and Android. But, if you're a fan of portrait videos (you monster) you can continue your upright video shooting ways. For viewers, they can watch videos in either landscape or portrait mode regardless of how they are shot. The app will auto rotate the video to compensate how the phone is held.