基于H.264运动估计的音视频同步编码技术

Audio-video synchronous coding based on motion estimation in H.264

提出了一种在H.264运动估计过程中嵌入音频的音视频同步编码方法,利用1/4像素精度的运动搜索,解决了音视频同步编码问题。在发送端,根据1/4像素搜索点和音频的对应关系,在1/4像素运动估计过程中通过调整最优匹配点将音频压缩流嵌入视频中,然后对嵌入音频的视频流进行压缩编码。在解码端,根据嵌入准则,提取音频信息,再对音频和视频信号进行重构和恢复。实验表明,本文方法在不增加音视频压缩数据量、在音视频质量下降较小的情况下,实现了音视频同步压缩编码和传输。

To solve the problem of audio-video synchronous coding effectively,an embedding scheme is proposed.This scheme applies the quarter-pixel motion search during the motion estimation in H.264.At the transmitter terminal,according to the mapping rule between the binary audio bits and the search points,the audio bits are embedded into the video signal by modulating the best search point in the quarter-pixel motion estimation.Then the synchronous coding is applied to the hybrid signals.At the receiver terminal,the audio information bits are extracted from the video stream according to the embedding rule.Then the audio and video signals are reconstructed respectively.Experiment results show that the proposed scheme can achieve audio-video synchronous coding with low embedding cost and good performance in quality of video and audio signals.