Distributed & Cached MP4 PseudoStreaming (seeking) with Nginx
You must use proxy_store. proxy_cache will create a lot of files for every ?start=xxxx request.
To let an mp4 module seek in files you need the full movie. proxy_store will make a mirror on the cache server.
proxy_cache is part of proxy module. Currently you can't use nginx mp4 module with proxy, it only works for static files, that's it.