I have been attempting to resolve an issue with AirPlay from an iPad to AppleTV. Here are the details:
Playing media (audio or video) originating on the iPad sent to AppleTV via AirPlay does not work.
With audio-only media, the result is mostly silence with occasional very short bursts (less than 100ms) of sound.
With video, the video does not play at all. The TV display can be one of
black screen with a rotating spinner in the center
black screen with the blue time bar at the bottom and a rotating spinner at the bottom left
white screen with the blue time bar at the bottom and a rotating spinner at the bottom left
The failure mode is extremely specific, and requires:
The media being played resides physically on the iPad. Media of any type being streamed from the Internet via the iPad does not have this problem.
The problem occurs only when both the iPad and AppleTV are on the same 5GHz network. Any other combination with either the iPad or AppleTV or both on the 2.4GHz network operates correctly.
iPad mdl:MC979LL iOS:5.1.1 AppleTV mdl:MD199LL/A OS:5.1.1(5433) Router Netgear WNDR3400V2 with firmware V220.127.116.11_1.0.52
The router is running in access-point mode where it does not do any routing, just provides wireless access.
During testing I tried the following:
Changing WiFi channels
Upgrading the router firmware to the latest version
Rebooting and power-cycling all equipment multiple times, including hard-resetting the iPad
Testing with iTunes on the PC not running, in case it is somehow saturating the connection to the AppleTV
"Reset Network Settings" on the iPad.
So far no luck.
BTW, I wanted to tag this post 802.11n but that tag does not exist and I can't create it with less than 300 rep. Would somebody please create that tag, add it here and delete this paragraph? Thx.