Code rate smoothing method of video live transmission through wireless network

Abstract

The invention provides a code rate smoothing method of video live transmission through wireless network. The method comprises the steps that the periodic statistics of transmission delay of video frames is conducted, when the transmission delay gets smaller, playing buffer is turned down through playing speeding up, when the transmission delay gets bigger, the playing buffer is turned up through playing slowing down, and the adjusting step length of the playing speeding up and the adjusting step of the playing slowing down are codetermined by changing of the transmission delay, the playing buffer depth and timestamp information. By means of the code rate smoothing method of video live transmission through wireless network, the statistics of the transmission delay of the video frames can be conducted, the wireless network state is perceived according to time delay information, the minimum video time delay is further found out according to the actual network condition to achieve the smooth effect, and balance between real-time performance and fluency performance of video streaming is achieved.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a code rate smoothing method for real-time video transmission under a wireless network. Background technique [0002] At present, for applications with high real-time requirements such as video conferencing, a method of directly playing video frames after receiving them is usually adopted. This method focuses on real-time performance. However, when video transmission is performed on a wireless network, due to the large size of some video frames (such as I frames), the instantaneous bit rate may become twice or more than the average bit rate, and burst data is easy. As a result of network congestion, the time required to transmit these frames is relatively long, resulting in obvious jitter when the video frame is transmitted. In this case, if the method of displaying the video frame is still used at the receiving end, there will be a video The phenomenon of timing freeze ser...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of not only ensuring the real-time performance of video transmission, but also improving its transmission quality and ensuring its fluency as much as possible, the present invention proposes a bit rate smoothing method for real-time video transmission under wireless network, based on the play cache mechanism On the one hand, by periodically counting the transmission delay of video frames to dynamically perceive the changes in the wireless network, thereby dynamically adjusting the size of the playback cache, avoiding unnecessary cache time as much as possible, and making video transmission real-time and smooth at a small cost A better balance between them, that is, under the premise of ensuring fluency, use a relatively small delay when the network status is good, and use a relatively large delay when the network status is poor

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