I recall a few other resources in the same category as this. Here are a few links for meta-coverage on them, which may provide more beneficial than spending hours trying to delve into how to use them:

VidBolt: http://chronicle.com/blogs/profhacker/annotate-video-on-the-fly-a-review-of-vidbolt/56787

Socialbook: http://chronicle.com/blogs/profhacker/using-video-annotation-tools-to-teach-film-analysis/57171

Other tools of interest, which you'll see notes on in the comments to the two above articles:

VideoAnt: http://ant.umn.edu

ULBPodcast: https://github.com/ulbpodcast and http://ezcast.ulb.ac.be (open source code available)

Genius.com: http://boffosocko.com/2014/04/08/rap-genius/ Particularly take a look at http://lit.genius.com/ which is a great tool for classrooms to do small scale shared annotations and close reading with the benefit of full texts (in particular, try looking up the various creation stories, eg: Gilgamesh [http://genius.com/Epic-of-gilgamesh-tablet-1-the-coming-of-enkidu-annotated; Letters of Paul [http://genius.com/Laura-nasrallah-the-pauline-epistles-contents-annotated], which was part of HarvardX religious studies course and is an excellent example of using the platform for education]). There's also http://genius.com/history-genius.

#BigHistory