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Code rate control method for video coding and video data emission device

A technology of video data and bit rate control, applied in the field of video coding, can solve the problem that predictive coding cannot be well suited, and achieve the effect of good video display effect

Inactive Publication Date: 2008-06-11
GUANGDONG VTRON TECH CO LTD
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Problems solved by technology

[0003] However, both of the above two real-time coding rate control methods fail to fully consider the network bandwidth conditions, and simply generate the current coding rate through the previous coding rate, resulting in predictive coding that cannot be well suited to the transmission of the current network conditions.

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  • Code rate control method for video coding and video data emission device
  • Code rate control method for video coding and video data emission device
  • Code rate control method for video coding and video data emission device

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Embodiment Construction

[0021] The packet loss rate refers to the loss of network transmission data. When the data packets generated by video encoding are relatively large, and the network conditions are good, the data packet transmission is better, and the packet loss rate is relatively small, or even not lost. However, when the network condition is not good, the packet loss rate may be serious, which will cause the video image received by the receiver to be unsmooth, or even mosaic. It can be seen that the packet loss rate will affect the transmission quality of video data. The bit rate control method of video coding provided by the invention controls the output bit rate by considering the factor of packet loss rate, so that the encoded data can better adapt to the transmission of the current network conditions, thereby achieving better video display effect.

[0022] In the present invention, the sending of the data packets carrying video data is based on RTP (Real-time Transfer Protocol, Runtime Tr...

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Abstract

The invention provides a code rate control method for video coding, wherein, control packages are sent at fixed period by a sender through a real-time transmission control feedback link; when feedback control packages are received, code rate is obtained according to package loss rate in the feedback control packages and video data is sent through the real-time transmission link according to the obtained code rate. The code rate control method for video coding and a transmitting device control output code rate by consideration of factors of package loss rate and encoded data can be suitable for transmission of current network conditions better, thereby better video display effect is reached.

Description

technical field [0001] The invention relates to video coding technology, in particular to a method for video coding code rate control. Background technique [0002] Video coding standards usually use intra-frame and inter-frame prediction, discrete cosine transform quantization and entropy coding techniques to achieve higher coding efficiency. For video communication, due to the limited bandwidth of the communication channel, it is necessary to control the video coding rate to ensure the smooth transmission of the coded stream and the full utilization of the channel bandwidth. For different application occasions, there are currently multiple rate control (RateControl) strategies. Among them, there are mainly two methods for real-time coding rate control: use the number of bits generated by previous macroblock coding to predict the number of bits generated by coding the current macroblock, or use a video coding rate-distortion function to predict the number of bits generated...

Claims

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Application Information

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IPC IPC(8): H04N7/24H04N7/26H04N19/164H04N19/166H04N19/85
Inventor 徐蜀中郑伟钿
Owner GUANGDONG VTRON TECH CO LTD
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