v1_EN_RTMPHandshake

RTMP Handshake

The rtmp specification 1.0 defines the RTMP handshake:

c0/s0: 1 bytes, specifies the protocol is RTMP or RTMPE/RTMPS.
c1/s1: 1536 bytes, first 4 bytes is time, next 4 bytes is 0x00, 1528 random bytes.
c2/s2: 1536 bytes, first 4 bytes is time echo, next 4 bytes is time, 1528 bytes c2==s1 and s2==c1. This is the simple handshake, the standard handshake, and the FMLE use this handshake.

While the server connected by flash player only support simple handshake, the flash player can only play the vp6 codec, and do not support h.264+aac. Adobe changed the simple handshake to encrypted complex handshake, see: Changed Handshake of RTMP

The handshake summary:

Handshake	Depends	Flash player codec	Client	SRS	Use Scenario
Simple Standard	No	vp6+mp3/speex	All	Supprted	Encoder, for examle, FMLE, FFMPEG
Complex	openssl	vp6+mp3/speex h264+aac	Flash Player	Supported	Flash player requires complex handshake to play h.264+aac codec.