New-style handshake has been implemented in nginx-rtmp-module. It's based on s HMAC SHA256-signed random bytes sent in either direction. This kind of handshake is used by all recent Flash clients and is obligatory for playing H264 by such clients. Now both old-style & new-style handshake models are supported. H264 is now can be streamed by nginx-rtmp-module.
One of major features in nginx-rtmp-module is support of relays. Relays are needed for distributed data streaming. The module supports two relay models: push and pull. Push model lets you re-translate locally published stream to a remote RTMP server. Pull model makes it possible to take stream from remote machine and publish it locally. Relays are turned on with pull and push config directives.