What is the difference between RTP or RTSP in a streaming server

Question

I m thinking about developing a streaming server and I have the following question  do over RTSP  example url  rtsp   192 168 0 184 myvideo mpg  or RTP  example url  rtp   192 168 0 184    As I have understood  an RTSP server is mainly used for streaming of files that already exist  ie  not live  RTP server is used to broadcast   Somebody correct me if I m wrong  am I right    What I want to develop a server to broadcast live content on the computer screen  that is  which is displayed at the time that is broadcast in streaming

User · Answer

AFAIK  RTSP does not transmit streams at all  it is just an out-of-band control protocol with functions like PLAY and STOP   Raw UDP or RTP over UDP are transmission protocols for streams just like raw TCP or HTTP over TCP   To be able to stream a certain program over the given transmission protocol  an encapsulation method has to be defined for your container format  For example TS container can be transmitted over UDP but Matroska can not   Pretty much everything can be transported through TCP though    The fact that which codec do you use also matters indirectly as it restricts the container formats you can use

User · Answer

RTSP  actually RTP  can be used for streaming video  but also many other types of media including live presentations  Rtsp is just the protocol used to setup the RTP session   For all the details you can check out my open source RTSP Server implementation on the following address  https   net7mma codeplex com   Or my article   http   www codeproject com Articles 507218 Managed-Media-Aggregation-using-Rtsp-and-Rtp  It supports re-sourcing streams as well as the dynamic creation of streams  various RFC s are implemented and the library achieves better performance and less memory then FFMPEG and just about any other solutions in the transport layer and thus makes it a good candidate to use as a centralized point of access for most scenarios

User · Answer

You are getting something wrong    RTSP is a realtime streaming protocol  Meaning  you can stream whatever you want in real time  So you can use it to stream LIVE content  no matter what it is  video  audio  text  presentation      RTP is a transport protocol which is used to transport media data which is negotiated over RTSP   You use RTSP to control media transmission over RTP  You use it to setup  play  pause  teardown the stream     So  if you want your server to just start streaming when the URL is requested  you can implement some sort of RTP-only server  But if you want more control and if you are streaming live video  you must use RTSP  because it transmits SDP and other important decoding data   Read the documents I linked here  they are a good starting point

User · Answer

I hear your pain  I m going through this right now  years later   From what I ve learned  you can think of RTSP as a  VCR controller   the protocol allows you to specify which streams  presentations  you want to play  it will then send you a description of the media  and then you can use RTSP to play  stop  pause  and record the remote stream  The media itself goes over RTP  RTSP is normally implemented over a different socket or communication layer  Although it is simply a protocol  most often it s implemented by a server over a socket  For live streams  the RTSP stream you request is simply a name of a stream  It doesn t need to refer to a file on the server  the server s RTSP implementation can parse that stream  put together a live graph  and then provide the SDP  description  for that stream name  But  this is of course specific to the way the RTSP server has been implemented  For  live  streams  it s probably simpler to just use RTP  but you ll need a way to transfer the SDP from the RTP server to the client that wants to play that stream

User · Answer

I think thats correct  RTSP may use RTP internally

User · Answer

Some basics   RTSP server can be used for dead source as well as for live source  RTSP protocols provides you commands  Like your VCR Remote   and functionality depends upon your implementation  RTP is real time protocol used for transporting  audio and video in real time  Transport used can be unicast  multicast or broadcast  depending upon transport address and port  Besides transporting RTP does lots of things for you like packetization  reordering  jitter control  QoS  support for Lip sync       In your case if you want broadcasting streaming server then you need both RTSP  for control  as well as RTP  broadcasting audio and video  To start with you can go through sample code provided by live555

[streaming] What is the difference between RTP or RTSP in a streaming server?

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