$ git clone git@github.com:slopen/react-sourcebuffer-montage.git
$ cd react-sourcebuffer-montage/example
$ npm i
$ cd data && mkdir videos
$ chmod 777 *.sh
$ sh bootstrap.sh
will download blender/demo/movies/Sintel.2010.720p.mkv and slice to 10 .webm files
$ npm start
open http://localhost:9090 in browser