(Article Source: Kiloview thousand view)
What are the network video transfer protocols, and the characteristics between RTSP / RTMP / SRT / RTP details:
RTP protocol is a network transport protocol, a real-time transport protocol technology, RTP protocol is often used in streaming media systems (with RTSP protocol) video conferencing and a Push to Talk system (with H .323 or SIP) makes it a technical foundation for IP telephony industry. The RTP Real-Time Transport Protocol provides data for end-to-end transfer services with real-time feature, such as interactive video audio or analog data under multicast or unicast network.
The RTSP protocol is the earliest video transfer protocol, RTSP is a real-time streaming protocol, an application layer protocol in the TCP / IP protocol system, and RTSP defines how a pair of multimedia data is transmitted efficiently through IP networks. RTSP is located on the RTP and RTCP on the architecture that uses TCP or UDP to complete data transfer.
The RTSP also provides an extensible framework that makes real-time data, such as controlled point of audio and video, and data sources include field data and data stored in the clip. The RTSP protocol has been controlled to video frames, so it can carry a high real-time application.
The RTMP protocol is a real-time message transfer protocol based on TCP, which is a protocol family, including RTMP basic protocols and RTMPT / RTMPS / RTMPE and other variants. RTMP is a network protocol designed for real-time data communication, primarily to audio and video communications between the Flash / Air platform and stream media / interactive servers supporting the RTMP protocol. RTMP is an open protocol for audio, video and data transfer between Flash players and servers.
The RTMP protocol is like a container that is used to load the packet, which can be both AMF format data or the view / audio data in the FLV. A single connection can transmit multiplexed network streams through different channels. The packages in these channels are transmitted in accordance with the fixed size package. HLS Agreement is an Apple's dynamic code rate adaptive technology, mainly used for audio and video services of PC and Apple terminals. Small slices of HLS protocols generate a large number of files, store or handle these files, causing a lot of resource waste.
If you want to implement a few days, the index will be a huge number and clearly affect the request speed. Therefore, the HLS protocol requires quite demanding on the storage I / O. HLS only requests basic HTTP packets, unlike real-time transport protocols (RTP), HLS can pass any firewall or proxy server that allows HTTP data to pass through. It is also easy to use a content distribution network to transfer media streams.
The SRT protocol is the brief referred to as the SRT, which is established by HaiVision and Wowza, managed and supports the organization of SRT protocol open source applications. This organization is committed to promoting the interoperability of video stream solutions, and promoting video industry pioneer cooperation To achieve low delay network video transmission.
The SRT is allowed to establish a connection directly between signal sources and targets, which has a stark contrast to many existing video transmission systems, which require a centralized server to collect signals from the remote location, and redirect it to one or Multiple destinations. The architecture based on the central server has a single point of failure, which may also become a bottleneck during high traffic. The transmission signal by the hub also increases end-to-end signal transmission time, and may double the bandwidth cost.
Because two links need to be implemented: a slave to the central hub, another from the center to the destination. By using the connection directly to the destination, SRT can reduce delay, eliminate central bottlenecks, and reduce network costs. The SRT protocol has some extensions and customizations on the basis of UDT, with network transmission packet detection / delay control / video encryption.
NDI Agreement (Network Device Interface) is an IP Network Device Interface Protocol. It is the standard protocol for ultra-low delay, lossless transmission, and interactive control; allows video compatibility products to make video sharing open protocols through the local area network, which is ultra-low delay, non-destructive transmission, interactive control. protocol;
NDI is an open protocol that makes video-compatible products through the LAN for video sharing. NDI transmission compared to coaxial cable transmission more price advantage, more stable, and more disturbed. The NDI can transmit and receive multiple broadcast-level quality signals in real time, while having low delays, accurate frame video, data stream mutual identification, and communication characteristics. NDI supports an access mechanism that allows manual input of IP addresses on other subnets that are running NDI sources.
(Editor: fqj)
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