Real Time Media Flow Protocol

Real Time Media Flow Protocol

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Real Time Media Flow Protocol (RTMFP) is a new communication protocol from Adobe thatenables direct end user to end user peering communication between multiple Adobe Flash Playersand applications built using the Adobe AIR framework for the delivery of rich, live, real‐timecommunication.

Operation

By using RTMFP, applications that rely on live, real‐time communications, such social networks and multi‐user games will be able to deliver higher quality communication solutions. RTMFP enables end‐users to connect and communicate directly with each other using their computer’smicrophone and webcam. RTMFP will not support file or document sharing. This solution enhancesthe current functionality in the Flash Player by creating a higher quality solution that will perform better regardless of variations in the network

Benefits of RTMFP

RTMFP will reduce the bandwidth costs for direct, live, real‐time communication solutions, such as audio and video chat and multi‐player games. Because RTMFP flows data between the end‐userclients and not the server, bandwidth is not being used at the server so solutions are less expensive to scale.RTMFP also increases the quality of delivery through the use of UDP. UDP is a more efficient (but less reliable) wayto send video and audio data over the Internet that reduces the penalties associated with missing, dropped, or out of order packets.RTMFP has two features that may help to mitigate the effects of connection errors.

Rapid Connection Restore: Connections are re‐established quickly after brief outages. Forexample, when a wireless network connection experiences a dropout. After reconnection,the connection has full capabilities instantly.

IP Mobility: Active network peer sessions are maintained even if a client changes to a new
IP address. For example, when a laptop on a wireless network is plugged into a wiredconnection and receives a new network address.

Difference between RTMP and RTMFP

The principle difference is how the protocols communicate over the network. RTMFP is based on
User Datagram Protocol (UDP), whereas RTMP is based on the Transmission Control Protocol (TCP).UDP‐based protocols have some specific advantages over TCP‐based protocols when delivering live streaming media, such as decreased latency and overhead, and greater tolerance for dropped/missing packets, at the cost of decreased reliability.Unlike RTMP, RTMFP also supports sending data directly from one Adobe Flash Player to another,without going through a server. A server‐side connection will always be required to establish the initial connection between the end‐users and can be used to provide server‐side data execution or gateways into other systems. The user of a Flash Media Server will also be required to authorize network address lookup and NAT traversal services for the clients to prevent Flash Player from being used in an unmanaged way.

History

The technology is a result of Adobe’s acquisition of Amicima in 2006.

ee also

* Adobe Flash Player
* Real Time Messaging Protocol

References

* [http://download.macromedia.com/pub/labs/flashplayer10/flashplayer10_rtmfp_faq_070208.pdf RTMFP FAQ] - from Adobe
* [http://justin.everett-church.com/index.php/2008/05/16/rtmfp-in-flash-player-10-beta RTMFP in Flash Player 10 beta] - Justin's Flash Blog
* [http://justin.everett-church.com/index.php/2008/05/23/astrop2p Peer to Peer (P2P) in Flash Player 10 beta] - Justin's Flash Blog

External links

* [http://labs.adobe.com/technologies/flashplayer10/ Flash Player 10]
* [http://labs.adobe.com/technologies/flashplayer10/releasenotes.html Flash Player 10 Release Notes]


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