Real-time video transmission method based on IP network
A transmission method and real-time video technology, applied in the field of video transmission technology, can solve problems such as large display delay and no coverage technology, and achieve the effect of improving reliability, solving packet loss and disorder problems, and avoiding normal decoding.
Active Publication Date: 2010-07-21
SHANGHAI JINSHAN PETROCHEM LOGISTICS
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[0006] Nuclear Electronics and Detection Technology published the article "Mpeg4 Network Video Stream Processing System Based on DirectShow" in January 2007 (Volume 27, Issue 1), which used the ring buffer technology in the receiving end processing, but did not use the overlay technology. In the case of high network jitter, a large display delay will be generated
[0007] The article "Design of Video Transmission System Based on DirectShow" was published in Volume 27, Issue 2, 2008 of Automation Technology and Application, but did not use any technology that conflicts with this patent
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[0019] The present invention will be further illustrated below through an implementation case.
[0020] The whole system mainly includes two major components: the sending end and the receiving end (see the whole system structure figure 1 ); the sending end realizes real-time video capture, and uses compression algorithms such as MPEG4 / H.264 for video compression. The sending end has a fixed public network IP address, listens on a fixed TCP port, waits for a video request from the client, and includes the compressed video data in the content of the TCP message and sends it to the receiving end (network message See the structure diagram figure 2 ); if neither the sender nor the receiver has a fixed public IP address (such as accessing the Internet through NAT), a third-party server with a public address is required to implement data transfer.
[0021] The receiving end is realized through multimedia frameworks such as directshow / gstreamer. Under the multimedia framework, the...
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The invention discloses a real-time video transmission method based on an IP network. A transmitting end and a receiving end use a TCP protocol on a transmission layer to improve the reliability of data transmission; the receiving end is stored in a receive buffer zone by taking an image frame as the unit; the receive buffer zone is organized in an annular mode; a newest frame can be used for covering most outdated frame under the condition of slow treatment to keep the instantaneity of data; directshow / gstreamer and the like serve as a multimedia framework; and the timestamp of the receiving end video frame is adjusted in real time according to the clock feedback of a display end. The invention takes the TCP protocol as the transmission layer protocol to effectively improve the reliability of video transmission, solve the problems of packet loss and disorder of network transmission and avoid the phenomenon that a decoder can not normally decode; the image information is stored in an annular buffer zone by taking the frame as the unit to effectively solve the problems of time delay and shake; a multimedia framework is used on the receiving end; according to the clock feedback of a display filter, the output video frame timestamp of the filter is adjusted in real time to ensure that the video can be smoothly played.
Description
technical field [0001] The invention relates to an IP network-based video transmission technology, which is especially suitable for network environments with poor QoS (quality of service), such as wireless networks. Background technique [0002] With the development of network technology, video surveillance based on IP network has gradually become a hot spot in the field of security. Using the existing IP broadband network, video data can be transmitted on the existing IP network without building a separate video line. At present, video transmission based on IP network mainly uses UDP protocol at the transport layer, and RTP protocol at the application layer, which can meet the smooth transmission of video streams when the network quality of service (QoS) is good. [0003] The quality of service of an IP network mainly includes four aspects: delay, jitter, packet loss, and disorder. Videos are usually compressed using algorithms such as MPEG4 / H.264 before transmission to r...
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Inventor 高军刘广钟
Owner SHANGHAI JINSHAN PETROCHEM LOGISTICS