Video bitrate control method based on frame loss and quantization parameter adjustment

A technology of bit rate control and quantization parameters, applied in the field of video coding, can solve the problem of unable to reach the target bit rate, achieve good application prospects and ensure the effect of encoding quality

Active Publication Date: 2015-03-25
BEIJING KINGSOFT CLOUD NETWORK TECH CO LTD
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Problems solved by technology

[0008] The purpose of the present invention is to overcome the existing video code rate control process. The typical algorithm

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  • Video bitrate control method based on frame loss and quantization parameter adjustment

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[0032] In the following, in conjunction with the accompanying drawings of the specification, the following embodiments are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.

[0033] The video code rate control method based on frame loss and quantization parameter adjustment of the present invention, after the encoder finishes encoding each frame of video content, according to the number of bits generated in the frame, the quantization parameter used, the buffer status and the cumulative consumption The information of the number of bits to determine whether it is necessary to skip the encoding of the next frame, if it is determined that the next frame needs to be encoded, calculate the target number of bits for the next frame, and then calculate the quantization parameter that should be used to encode the next frame through a certain method , Encoding the next frame is mo...

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Abstract

The invention discloses a video bitrate control method based on frame loss and quantization parameter adjustment. After each frame of video content is coded by a coder, whether coding of the next frame needs to be skipped over or not is judged according to the bit number generated by the frame, quantization parameters used by the frame, the buffer state and accumulated more-consumed bit number information; if it is determined that the next frame needs to be coded, the target bit number of the next frame is calculated, and quantization parameters which should be used by coding of the next frame are calculated through a certain method, the next frame is coded, and compared with a traditional bitrate . QP model, the method is accurate and reliable, so that it is ensured that the output bitrate of the video coder is matched with a channel bandwidth, coding quality is ensured, and the method has the good application prospect.

Description

technical field [0001] The invention relates to a video code rate control method based on frame loss and quantization parameter adjustment, and belongs to the technical field of video coding. Background technique [0002] In many multimedia applications such as video communication and live video streaming, bit rate control is a very critical module. It is used to match the bit rate generated by the encoder with the channel bandwidth, and on this basis, try to ensure the minimum image distortion. Therefore, the bit rate control is mainly restricted by the channel bandwidth conditions and video content, as follows, [0003] On the one hand, channel transmission bandwidth is usually not constant, especially for wireless 3G channels, whose network bandwidth is usually time-varying, which requires the encoder to be able to adjust the bit rate of the output video in real time according to changes in real-time bandwidth; [0004] On the other hand, the content of video is also eve...

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Application Information

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IPC IPC(8): H04N19/146H04N21/2662
CPCH04N21/2662
Inventor 王悦朱政彭斌金星林松丁丹丹
Owner BEIJING KINGSOFT CLOUD NETWORK TECH CO LTD
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