Implementation of real-time transmission based on Jrtplib library under LinuxRTP is a standard protocol and key technology for real-time streaming media transmission.Real-time transport protocol (real-time transport PROTOCOL,PRT) is a network protocol for processing multimedia data streams on the Internet, which can be used in one-to-one (unicast, unicast) or one-to-many (multicast, multicast), the real-time transmission of Liu Media data is realized in the network environment.
Real-time transmission protocol RTP
1. RTP protocol:RTP (Real-Time Transport Protocol) was originally used in 1970s to try to transfer audio files, divided into several parts to transmit voice, time signs and queue numbers. After a series of developments, the first version of RTP was released by a laboratory in the United States in August 1991. By the 1996 s of t
for different NAT types.
L UPnP
L external Query
L stun
L ALG
Among them, the first three are obtained by the SIP client (including UA and proxy) by some means or protocol before the invite. The SIP client is required to provide additional support and is not applicable to all Nat methods.
The ALG (Application Layer Gateway) is applicable to all Nat methods and does not require any additional support from the SIP client. It processes and modifies the sip signaling at the application layer to ach
RTP Reference Document
Rfc3550/rfc3551
Real-Time Transport Protocol) is a transport layer protocol for multimedia data streams on the Internet. The RTP protocol details the standard packet formats for transmitting audio and video on the Internet. RTP is often used in streaming media systems (with RTCP protocol), video conferencing and one-click push to talk syste
RTP
Reference rfc3550/rfc3551
Real-Time Transport Protocol) is a transport layer protocol for multimedia data streams on the Internet. The RTP protocol details the standard packet formats for transmitting audio and video on the Internet. RTP is often used in streaming media systems (with RTCP protocol), video conferencing and one-click push to talk systems (with
transmitting real-time audio and video data. To achieve real-time transmission of audio and video data, we need to seek other channels.4. RTP protocol is suitable for real-time video and audio transmission.
RTP (Real-time transport protocol)/RTCP (Real-Time Transport Control Protocol) is an application-oriented transport layer protocol, it does not provide any guarantee of Transmission reliability and tra
This article focuses on the frame capture method and transfers the focus from video4linux to the network. In terms of instant transfer of network images, RTP is also the standard used by major manufacturers. In this phase, we will be able to learn how to use jrtplib
To add network functions.
Video4linux frame capture method
In the last issue of xawtv, we saw the image capture function of xawtv,
Among them, the most important part is to use video4linux
//The Ben function is used to calculate jitter, and this function is called to calculate jitter each time a RTP packet is received. voidRtpreceptionstats::noteincomingpacket (u_int16_t seqNum, u_int32_t rtptimestamp, unsigned Timestampfrequen CY, Boolean Useforjittercalculation,structtimevalResultpresentationtime, Booleanresulthasbeensyncedusingrtcp, unsigned packetsize) { if(!fhaveseeninitialsequencenumber) Initseqnum (seqNum); ++fnumpacketsreceived
I. About ortp
Ortp is an open-source software that implements the RTP and RTCP protocols. Currently, the software that uses the ortp library is mainly Linphone (a software for video and voice calls based on IP addresses ).
As the RTP Library of Linphone, ortp guarantees the transmission of voice and video data based on the RTP protocol.
Ii. Source Code constru
Streptococcus mutans, a gram-dyed positive bacterium, is one of the most important components of the genus Streptococci, which is the largest proportion of the oral natural flora. Caries is a bacterial infectious disease occurring in the hard tissue of the tooth, the highest incidence in oral diseases. Streptococcus mutans is the main pathogenic bacteria of dental caries, and its transmission methods are various, including maternal transmission, pater
Relationships can be seen in the gut where certain bacteria are probiotics, which are harmful bacteria in the mouth.Because different organs have different physiological functions, the same bacteria can play different roles.such as lactic acid bacteria.Oral Microbiology is the study of the microorganisms of the Oral cavity (cavity) and the interactions (interaction) between the Oral microorganisms (microorganisms) with the host. Of particular interest is the role of oral microorganisms in the ot
RTCP]
RTP (Real-timetransportprotocol) is a transmission protocol for multimedia data streams on the Internet. RTP is defined to work during one-to-one or one-to-many transmission. It aims to provide time information and implement stream synchronization. RTP usually uses UDP to transmit data, but RTP can also
Document directory
RTP Stacks (mainly open source C/C ++ stacks)
SIP Stacks
RTP Applications
SIP Phones (SIP User Agents)
SIP Test Utility
SIP Applications (Proxy, Location Server)
Sip Express Router (ser)
Ser Media Server (sems)
STUN server and clients
NAT traversal ALG (application level gateway)
Below you will find descriptions and links to SIP and RTP
a single first-class transmission after the video and audio streams are reused, the support of MPEG-2 ts over IP for multi-track, multi-word screen and future interactive scenarios needs to encapsulate all stream information in a unified manner, this is a waste of bandwidth that users do not need. If video communication, VoIP and other traffic business, MPEG-2 ts over IP Mode also need to expand to support.
2. Support for Business Performance
Isma introduces the
H.264 is the latest video coding standard for ITU-T, known as ISO/IEC14496-10 or MPEG-4 AVC, and is a new product jointly developed by the video coding Expert Group of Motion Image Expert Group (mPEG) and ITU. H.264 is divided into two layers, including the video encoding layer and network adaptation layer. The video encoding layer processes block, Macro Block, and chip data and tries its best to be independent from the network layer. 264 is the latest ITU-T video coding standard, known as ISO/I
I. Introduction
Ortp is a database that supports RTP and rfc3550 protocols. It has the following features:(1) It can be written in C language and can work on Windows, Linux, and UNIX platforms.(2) implements the rfc3550 protocol and provides easy-to-use APIs. Multiple configurations are supported. rfc3551 is the default configuration.(3) supports multiple RTP sessions in a single thread and adaptive jitter
What are the problems with SIP from private network to public network?
Address translation of the package.
SIP address Translation inside the SIP message.
The RTP address translation in the SDP inside the SIP message.
The existing structure of the network is complex, SIP service providers are not necessarily network providers, it is difficult to ask customers to use only some way of natfirewall. How to find a SIP application solution that can meet a
I. IntroductionH.264 is the latest video coding standard for ITU-T, known as ISO/IEC14496-10 or MPEG-4 AVC, and is a new product jointly developed by the video coding Expert Group of Motion Image Expert Group (mPEG) and ITU. H.264 is divided into two layers, including the video encoding layer and network adaptation layer. The video encoding layer processes block, Macro, and chip data and tries its best to be independent from the network layer. This is the core of video encoding, including many t
consists of a 1-byte header, three fixed-length fields, and an uncertain number of encoding segments.
Header mark Syntax: NALU type (5bit), importance indication bit (2bit), and prohibition bit (1bit ).
NALU type: 1 ~ 12 used by H.264, 24 ~ 31 is used by applications other than H.264.
Importance indication: indicates the importance of the nal unit for reconstruction. The greater the value, the more important it is.
Bit prohibited: when the network discovers that the nal unit has a bit error, yo
dialog_initialize_rtp function to initialize the RTP information of the peer.
Whether the peer has RTP. If yes, the encoding is set. When setting the RTP engine, it must be noted that the RTP protocol stack was greatly changed at the beginning of asterisk1.8. By default, the RTP
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