Prism: Handling Packet Loss for Ultra-low Latency Video

Prism: Handling Packet Loss for Ultra-low Latency Video
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Prism:处理超低延迟视频的丢包

DOI:
10.1145/3503161.3547856
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发表时间:
2022
期刊:
MM '22: Proceedings of the 30th ACM International Conference on Multimedia
影响因子:
--
通讯作者:
Seshan, Srinivasan
Seshan, Srinivasan
中科院分区:
--
文献类型:
--
作者:
Ray, Devdeep;Bobadilla Riquelme, Vicente;Seshan, Srinivasan

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实时交互式视频流应用,如基于云的视频游戏、AR和VR,需要高质量的视频流和极低的端到端交互延迟。这些要求导致QoE对丢包极为敏感。由于压缩帧之间的相互依赖性,数据包丢失会使视频解码管道停滞,直到丢失的数据包被重新传输(导致口吃和更高的延迟),或者使用idr帧(给定带宽的较低视频质量)重置解码器状态。Prism是一种混合预测-响应式丢包恢复方案,它使用分流视频编码技术来满足超低延迟视频流应用的需求。Prism的方法可以实现积极的损失预测、快速的损失恢复和高质量的恢复后视频质量,在正常操作期间零开销,避免了现有方法的缺陷。我们对真实视频游戏画面的评估表明,Prism将使用i帧进行恢复的损失降低了81%,同时比纯粹的基于重传的恢复降低了30%的延迟。
Real-time interactive video streaming applications like cloud-based video games, AR, and VR require high quality video streams and extremely low end-to-end interaction delays. These requirements cause the QoE to be extremely sensitive to packet losses. Due to the inter-dependency between compressed frames, packet losses stall the video decode pipeline until the lost packets are retransmitted (resulting in stutters and higher delays), or the decoder state is reset using IDR-frames (lower video quality for given bandwidth). Prism is a hybrid predictive-reactive packet loss recovery scheme that uses a split-stream video coding technique to meet the needs of ultra-low latency video streaming applications. Prism's approach enables aggressive loss prediction, rapid loss recovery, and high video quality post-recovery, with zero overhead during normal operation - avoiding the pitfalls of existing approaches. Our evaluation on real video game footage shows that Prism reduces the penalty of using I-frames for recovery by 81%, while achieving 30% lower delay than pure retransmission-based recovery.
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