LocalCast features a seamless Kodi integration. From the Settings(-> Kodi) you can easily write a file which tells Kodi to use LocalCast. You can then enjoy all your media on the TV.
Please be aware that the Chromecast only supports a couple of formats. It can read containers like mp4, mkv, 3gp and m4v, but all these containers can use different codecs. If you can’t hear the audio of a video, then the audio codec is not supported. If you can’t see the video but hear the audio, then the video codec is not supported.