一种基于时间驱动实时视频流缓冲区的设计与实现

Design and Implementation of a Time-Driver-Based Buffer for Real-Time Video Stream

合理的缓冲区设计对保证实时视频压缩数据的正确解压缩及高品质播放起着关键作用.根据视频压缩数据的连续性和当前Internet网络力所能及的服务等特点,提出了一种基于时间驱动的缓冲区设计方案,并设计了一种可控制的模拟网络丢包乱序的测试方法,对比无缓冲情况和不同缓冲大小的情况来评估此缓冲区性能.测试结果表明,缓冲区可以平滑视频显示,能够较好地解决恶劣网络环境下的丢包、乱序等问题,并已经应用到某大型网通视频直播系统中.

Reasonable buffer design plays a key role in video stream＇s decoding and rendering at the receiver side. According to the continuity of packed video data and best-effort character of Internet, a time-driver-based buffer is proposed. And a test method is also introduced to control the packet drop-out and disorder. The performance evaluation of the buffer is done by contrast with no buffer and buffers of different size. The result indicated that this buffer performed well in smoothing video display and could resolve packet drop-out and disorder problem. The proposed design has widely been applied to a certain large-scale client system receiving real-time video stream.