I also use the "Videostream for Chromecast" chrome app a lot. It's less of a media library than a "play this on my chromecast" tool with an Android remote that

I also use the "Videostream for Chromecast" chrome app a lot. It's less of a media library than a "play this on my chromecast" tool with an Android remote that can also choose files from your hard drive. I have less buffering with it, and it seems to know the media formats that chromecast supports natively better, as it doesn't transcode nearly as many files as Plex does.