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首页> 外文会议>2010 IEEE International Symposium on Broadband Multimedia Systems and Broadcasting (BMSB 2010) >Eliminating periodical key frame in online lecture broadcasting by Peer-Assisted Reference Frame Synchronization
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Eliminating periodical key frame in online lecture broadcasting by Peer-Assisted Reference Frame Synchronization

机译：通过对等辅助参考帧同步消除在线讲座广播中的周期性关键帧

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摘要

In traditional video broadcast systems, the encoders have to insert periodical I frames (a.k.a. key frame) in order to allow newly arrived receivers to be able to start the decoding process in a timely manner. However, such insertion of periodical I frames will result a loss of encoding efficiency as these frames could actually have been encoded into more bit-rate efficient P/B frames instead. This issue is even more relevant for video sequences with very slow scene changes like that in an online lecture. In our p2p streaming based live lecture broadcast system named PPClass, we designed a novel scheme to address this issue. The key idea is that when a new receiver joins the channel, it will try to retrieve the necessary reference frames from peers which have already been watching the channel. Moreover, a new type of frame named Sync-P-frame is introduced in the encoder in place of the periodical I frame, which has similar coding efficiency as normal P frame but also remain the semantic as normal I frame in the sense of providing random-access points. The initial experiments proved the effectiveness of this mechanism.
机译：在传统的视频广播系统中，编码器必须插入周期性的I帧（又称为关键帧），以便允许新到达的接收机能够及时开始解码过程。但是，这种周期性的I帧的插入将导致编码效率的损失，因为实际上这些帧可能已经被编码为更具比特率的P / B帧。这个问题与场景变化非常缓慢的视频序列（如在线讲座中的视频序列）更加相关。在名为PPClass的基于p2p流的实时演讲广播系统中，我们设计了一种新颖的方案来解决此问题。关键思想是，当新的接收者加入该频道时，它将尝试从已经在观看该频道的对等方检索必要的参考帧。此外，在编码器中引入了一种新型的名为Sync-P-frame的帧来代替周期性I帧，该帧具有与普通P帧相似的编码效率，但在提供随机性的意义上仍保留了与普通I帧相同的语义-接入点。初步实验证明了该机制的有效性。

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