This is the "magic" of the plugin. iOS records video in HEVC (H.265) and ProRes. Many older TVs do not support these codecs. The Playit Cast Plugin performs on-the-fly transcoding on your iOS device (or a paired server) to convert the stream into H.264 or VP8, which is universally accepted. Without this plugin, your TV would likely display a "Format Not Supported" error.
To use the plugin successfully, ensure the following are met: Primary App: You must have the PLAYit Video Player Musicolet Music Player installed. Pro Features: i--- Playit Cast Plugin