Rapid channel change is commonly considered a critical factor that improves subscriber quality of experience. One of the major contributors to increased channel change time is the delay due to buffering a newly-acquired media stream before the stream is presented to the user. When the decoder operates at a constant playback rate, this initial buffering avoids playback stalls. An initial buffering delay on the order of seconds or more is not uncommon, especially with advanced video compression standards such as H.264 or H.265. This article presents a novel approach, which manages audio and video decoder clocks independently and reduces the initial buffering delay significantly. The method is low-cost and can be easily implemented in software to run on most modern media processors. The method has been deployed and verified in various IPTV networks. Experiments carried out in the field show that the presented technique can provide up to 62% reduction in overall channel change time compared to conventional methods.

中文翻译：

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使用多个解码器时钟的基于客户端的快速信道更改技术

快速的频道变化通常被认为是提高用户体验质量的关键因素。增加频道更改时间的主要因素之一是由于在将流呈现给用户之前缓冲新获取的媒体流而导致的延迟。当解码器以恒定播放速率运行时，这种初始缓冲可避免播放停顿。几秒或更长时间的初始缓冲延迟并不少见，尤其是对于 H.264 或 H.265 等高级视频压缩标准。本文介绍了一种新颖的方法，它独立管理音频和视频解码器时钟，并显着减少初始缓冲延迟。该方法成本低，可以很容易地在软件中实现，以在大多数现代媒体处理器上运行。该方法已在各种IPTV网络中得到部署和验证。