I have a 5S and 6 Plus, both on iOS 8.1. I have an Apple TV (very latest 3rd gen model). My mum has the same model at her house. Both Apple TVs are on iOS 8.1. I cannot get slo mo videos from 5S or 6 Plus to stream to AppleTV via AirPlay. It doesn't matter if I just try normal streaming or Mirroring, they won't play. They don't play on the iPhone screen or the TV. If I disconnect from AirPlay, they play on the iPhones just fine. Normal videos (i.e. not slo mo) play fine on Apple TV. Both Apple TVs are connected via Ethernet. iPhone 5S and 6 Plus connected via 5Ghz WiFi (802.11n for 5S and 802.11ac for 6 Plus). Any ideas?