commons.mediahandler.org A vm that has the same configuration as a commons app server. Lots of storage isn't necessary, since it'll just have a few test videos on it.
thumb scaler thumb.php style scaler for that machine
transcoder least two "cpu threads" that can act as transcoders
Nfs store backend that matches commons (NFS now, SWIFT later?), and is visible from the transcoders
en.wikipedia.mediahandler (or equivalent) to use Timed Media Handler cross-wiki embed
A squid in front of everything so we can catch any caching-related bugs
