Video Playback on the iPhone, iPad, and iPod
From KickApps Documentation
KickApps video play pages are equipped to identify iPhones, iPads, and iPods. When people view your video play page with one of these iDevices, the page will serve them an iDevice-compatible video, instead of your custom Flash player.
Please note: iDevices only support H.264-encoded .mp4 video files. All videos uploaded to KickApps are now encoded to iDevice-compatible .mp4 files; however, prior to 7-23-10, .flv files uploaded to KickApps were not encoded to iDevice-compatible .mp4s. All other video files were encoded to iDevice-compatible .mp4s. If a video uploaded prior to 7-23-10 is not playing on an iDevice, re-uploading it now will ensure that it does.