RTMP supports more media protocols than traditional media servers. RTMP and RTSP are both streaming protocols, meaning they are sets of rules that govern how data travels from one system of communication to another. RTMP handles sound, image, and script data separately. For example, type 2 indicates that the RTP packet carries voice data encoded with the ITU g.721 algorithm, with a sampling frequency of 8000Hz and mono. On the other hand, the receiving end sends a receive-side report RR to all known senders, which contains important information such as the maximum serial number of the received datagram, the number of lost datagrams, the delay jitter, and the timestamp, which can be used by the sending application to estimate the round-trip delay. Applications typically run RTP on UDP to use their multi-node and checksum services, both of which provide the functionality of the Transport Layer protocol. RTP provides mechanisms for time reconstruction, loss detection, security and content identification. The RTP protocol and the RTP Control Protocol (RTCP) are used together, and it is built on the UDP protocol. Typically, the RTCP uses the same distribution mechanism as RTP to periodically send control information to all members of the session, and the application receives the data, obtains information about the session participants, and the network condition, packet loss probability, etc. The reason why RTSP intentionally uses syntax and operations similar to http/1.1 is to a large extent compatible with the existing web infrastructure, and for this reason,most of the http/1.1 extension mechanisms can be introduced directly into RTSP. The main difference between RTMP and RTSP is the part of the live streaming process that they are each responsible for. These all have to do with how to negotiate connections for, and streaming real-time data like audio and video. From the RTP datagram format is not difficult to see, it contains the type of transmission media, format, serial number, time stamp and whether there is additional data and other information, which provides a corresponding basis for real-time streaming media transmission. the serial number in RTP allows the receiver to reorganize the sender's packet sequence , and the serial number can also be used to determine the appropriate packet location, for example: In video decoding, no sequential decoding is required. Related terms include RTP and RTCP or real time transport protocol and RTP control protocol. Live Streaming Protocol RTSP (real Time streaming Protocol) is a multimedia streaming protocol used to control sound or imagery, and allows simultaneous multiple streaming requirements control , and the network communication protocols used in the transmission are not within the scope of their definition, The server side can choose to use TCP or UDP to transmit the stream content , its syntax and operation is similar to HTTP 1.1, but does not particularly emphasize time synchronization, so the comparison can tolerate network latency. The only exception is that when using secure real-time transport Control Protocol SRTCP, its message authentication feature must be used. If you are trying to develop an interactive livestream application, you rely on ultra low (real-time) latency. RTMP is a Streaming Protocol associated with Adobe's Flash Player -- Made Very Popular by YOUTUBE. The transmission rate can be dynamically adjusted according to the probability of datagram loss and delay jitter to improve the network congestion, or to smoothly adjust the service quality of the application according to the network condition. The protocol is a container for data packets which may be in Action Message Format or a Format called raw audio/video data found in the Flash Video Format. 1, TCP is a point-to-Point protocol, which means that each client needs to separate client/server connections and therefore cannot implement data broadcasts to multiple clients at the network level . such as data encoding/decoding algorithm, network address, media streaming content. Both are alternatives to the stateless protocol HTTP. The RTSP protocol currently supports the following operations: Retrieving media: allows a user to submit a presentation description to the media server via HTTP or another method. RTMP and RTSP are two of those technologies. Hello, I'm using the PVC2300 camera in a 'soft' real-time application which requires a minimum of timing information. and provide relevant evidence. RTSP's request mainly has describe,setup,play,pause,teardown,options and so on, as the name implies can know the dialogue and control role. SIP - Session Initiation Protocol - A protocol that is used to initiate the session and exchange call parameters, QoS etc., required to set-up the call. RTSP is an interoperability disaster.None of the three big commercial implementations seem to abide by the standard(Microsoft Windows Media, Apple/Darwin and RealMedia),and writing a client stack that can handle all of them,plus the open-source servers properly, is... tough to say the least. In typical applications, RTP is typically implemented on top of the transport protocol as part of the application. … The Future of HLS vs MPEG-DASH. In the private RTSP code, the control, synchronization, etc., is in the RTP header to do the extension definition implementation. The left part is fetching the video stream with Wowza and the RTMP connection. Copy and past the URL of the RTSP stream into the "URL" field at the top of the screen. RTSP can provide streaming media such as play, pause, fast forward and other operations, it is responsible for defining the specific control message, operation method, status code, etc., also describes the interaction with RTP (RFC2326). Although the RTSP server also uses identifiers to differentiate between each first-class connection session (session), the RTSP connection is not bound to a transport layer connection (such as TCP, etc. Richard_Lanham. RTSP stands for Real Time Steaming Protocol and it's a widely recognized standard for streaming (audio/video). Others. [email protected] RTP by itself does not provide a reliable guarantee for sequential transmission of packets, nor does it provide traffic control and congestion control, which is done by RTCP. How about buyvm.net space? The RTP specification describes two protocols: RTP and RTCP. The relation of NPT and RTP time stamps in the video data and RTSP packets SHOULD be specified by a RTCP-SR packet (according to RFC3550). The live feed from the RTSP camera is sent to an RTSP server which typically transcodes it and forwards it to specific computers connected in a network. Because the RTCP datagram is multicast, all members of the session can use the control information returned by the RTCP datagram to understand the current situation of the other participants. RTCP's main function is to provide feedback on the quality of service provided by RTP (Quality of services), and to synchronize audio and video. RTMP vs. RTSP As the above examples show, the decision to use RTMP or RTSP is determined heavily by the use case and the devices being used to stream live video. Its basic functionality and packet structure is defined in RFC 3550.RTCP provides out-of-band statistics and control information for an RTP session. We are currently using OBS to combine the sound from our mixer with the … Category: IETF Source: RFC 3550, http://blog.csdn.net/frankiewang008/article/details/7665547. During the RTSP conversation, Setup can determine the port used by the RTP/RTCP, Play/pause/teardown can start or stop the RTP send, etc. The video data is processed in a similar manner, unlike when a new keyframe arrives and the data in the buffer is cleared. The RTCP control protocol needs to be used in conjunction with the RTP data protocol, and when an application initiates an RTP session, it consumes two ports, respectively, for RTP and RTCP . The RTCP itself does not provide data encryption or identity authentication. Comparing SRT and RTMP. The real-time transport protocol (real-time Transport Protocol) is a Transport layer protocol for multimedia traffic on the Internet . This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. Network applications can use the information provided by RTCP to try to improve the quality of services, such as restricting information traffic or using smaller codecs instead of compression. For example, you can produce a CSRC list that represents a conference call that combines the voice data of all speakers into one RTP data source through an RTP mixer. serial number : used to provide the receiver with the method of detecting data loss, but how to handle the lost data is the application's own business, the RTP protocol itself is not responsible for data retransmission. 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