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Method and device for transmitting multimedia data

A technology for multimedia data and multimedia data packets, applied in transmission systems, pulse modulated TV signal transmission, bidirectional working systems, etc., can solve problems such as packet loss, video transmission rate fluctuations, etc., to achieve the effect of uniform transmission

Inactive Publication Date: 2010-02-10
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a multimedia data transmission method and device, which solves the problem of packet loss caused when the video transmission rate fluctuates beyond the limited bandwidth

Method used

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  • Method and device for transmitting multimedia data
  • Method and device for transmitting multimedia data

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0036] In video conferencing technology, bandwidth control, window and congestion control are required, and the server cannot exceed the current allowed bandwidth; so that data can be sent evenly.

[0037] Among them, the sending window refers to how many messages the sending end can send to the receiving end for flow control;

[0038] The receiving window refers to how many messages the receiving end can receive after a certain message, which is used for flow control.

[0039] Such as Figure 4 Shown, the transmission method of multimedia data among the present invention, comprises the following steps:

[0040] Step 410, after the sending end sends a multimedia data packet to the receiving end, reduce the sending window; the sending end continues to send the multimedia data packet to the receiving end, and judges that if the sending window i...

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Abstract

The invention discloses a method and a device for transmitting multimedia data, and the method comprises the following steps: transmitting a multimedia data packet to a receiving end by a transmittingend and reducing a transmitting window; continuously transmitting multimedia data packets to the receiving end by the transmitting end; stopping transmitting the multimedia data packets to the receiving end when judging that the transmitting window is reduced to zero; reducing a receiving window after receiving the multimedia data packets transmitted by the transmitting end by the receiving end;and processing the received multimedia data packets. By adopting the invention, the problem of packet losing caused by the condition that video speed fluctuation exceeds limited bandwidth can be solved by bandwidth control, multimedia data can be evenly transmitted while images are free of garbled screen and audio output has no noise.

Description

technical field [0001] The invention relates to the field of multimedia communication, in particular to a method and device for transmitting multimedia data. Background technique [0002] The data encoded by the audio and video encoder in the video conferencing system is encapsulated into RTP packets and then transmitted through UDP, and finally handed over to the audio and video decoder for decoding and outputting sound and images. Such as figure 1 As shown, video frames are packetized over the network. [0003] RTP (Real-time Transport Protocol or RTP for short) is mainly used for multimedia data transmission. RTP itself does not provide a timely delivery mechanism or other quality of service (QoS) guarantees, does not guarantee delivery or prevent disorderly delivery, and is not sure The reliability of the underlying network. It relies on low-level services to do this. In the field of video conferencing, the underlying protocol of RTP is UDP (User Datagram Protocol). ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/06H04N7/24H04N7/15
Inventor 况成禹段新平刘建松汤宁
Owner ZTE CORP
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