Hi,
there is the tool by Holger which does that using WebM - but it is hosted on WMF Labs. It uses OAuth for unified login and moving the files to Commons.
Then, a more elaborate tool for * storing raw material at the Internet Archive * generating patent free WebM proxy clips for editing * rendering high-quality videos * moving these rendered videos to Commons directly
is the Video Editing Server, developed by some Wikipedians and a MLT developer, hosted by the Internet Archive:
https://wikimedia.meltvideo.com/
It also uses OAuth for login and moving files to Commons.
The workflow with this:
# upload all your raw files to the server for ## long-term storage ## to make them available to other editors ## to let the server use them in the rendering process
# the server transcodes all files into WebM "proxy clips"
# editors download the WebM proxy clips ## do the editing on your computer ## create an MLT project file (eg. using kdenlive or another MLT-based video editor)
# upload the project file ## server will replace proxy clips with raw material ## server will render video project ## server will move generated file to Commons
It comes with a search engine, meta data forms... it's still pretty new (development started in December '14) but can be used. We plan to add some more features like tagging using Wikidata QIDs (hence allowing multilingual / localised tagging / searching, adding more project file formats and renderer, making old project file revisions available for download, give it a nice vector-based theme, give it a better domain name and SSL certificate...
Play with it and have fun!
For source code or any issues refer to GitHub: https://github.com/ddennedy/wikimedia-video-editing-server
also there see the wiki for the specs and a deployment guide: https://github.com/ddennedy/wikimedia-video-editing-server/wiki
/Manuel