I have created a small html5 app that allows playing of local media on Google Chrome with playlist support. The Chrome tab can then be cast to Chromecast. This helps me play the huge collection of YouTube videos I have in my computer, on Chromecast. Just thought I'll put it on here for anybody that might find it useful.
Steps to use:
1. Open Google Chrome and go to sidscast . com
2. Browse for folder or files (Audio/Video) to add to playlist.
4. Cast tab to Chromecast
Audio/Video Formats suppported: MP4, MP3, Wav, WebM and Ogg
Playlist support: Yes