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首页> 外文期刊>IEEE Transactions on Broadcasting >Traffic and Quality Characterization of Single-Layer Video Streams Encoded with the H.264/MPEG-4 Advanced Video Coding Standard and Scalable Video Coding Extension
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Traffic and Quality Characterization of Single-Layer Video Streams Encoded with the H.264/MPEG-4 Advanced Video Coding Standard and Scalable Video Coding Extension

机译：使用H.264 / MPEG-4高级视频编码标准和可伸缩视频编码扩展编码的单层视频流的流量和质量表征

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摘要

The recently developed H.264/AVC video codec with Scalable Video Coding (SVC) extension, compresses non-scalable (single-layer) and scalable video significantly more efficiently than MPEG-4 Part 2. Since the traffic characteristics of encoded video have a significant impact on its network transport, we examine the bit rate-distortion and bit rate variability-distortion performance of single-layer video traffic of the H.264/AVC codec and SVC extension using long CIF resolution videos. We also compare the traffic characteristics of the hierarchical B frames (SVC) versus classical B frames. In addition, we examine the impact of frame size smoothing on the video traffic to mitigate the effect of bit rate variabilities. We find that compared to MPEG-4 Part 2, the H.264/AVC codec and SVC extension achieve lower average bit rates at the expense of significantly increased traffic variabilities that remain at a high level even with smoothing. Through simulations we investigate the implications of this increase in rate variability on (i) frame losses when transmitting a single video, and (ii) on a bufferless statistical multiplexing scenario with restricted link capacity and information loss. We find increased frame losses, and rate-distortion/rate-variability/encoding complexity tradeoffs. We conclude that solely assessing bit rate-distortion improvements of video encoder technologies is not sufficient to predict the performance in specific networked application scenarios.
机译：最近开发的具有可扩展视频编码（SVC）扩展功能的H.264 / AVC视频编解码器比MPEG-4 Part 2显着更有效地压缩了不可扩展（单层）和可扩展视频。由于编码视频的流量特性具有对其网络传输有重大影响，我们使用长CIF分辨率视频检查了H.264 / AVC编解码器和SVC扩展的单层视频流量的比特率失真和比特率变异性失真性能。我们还比较了分层B帧（SVC）与经典B帧的流量特性。此外，我们研究了帧大小平滑对视频流量的影响，以减轻比特率变化的影响。我们发现，与MPEG-4第2部分相比，H.264 / AVC编解码器和SVC扩展实现了更低的平均比特率，但代价是流量变化显着增加，即使经过平滑处理，流量变化也保持在较高水平。通过模拟，我们研究了速率可变性增加对（i）传输单个视频时的帧丢失和（ii）在链路容量和信息丢失受到限制的无缓冲统计复用情况下的影响。我们发现增加了帧丢失，以及速率失真/速率可变性/编码复杂度的折衷。我们得出的结论是，仅评估视频编码器技术的比特率失真改进不足以预测特定网络应用场景中的性能。

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