论文标题
Lagrangian乘法器在视频编码中的每盘和每两倍酸酯改编
Per-clip and per-bitrate adaptation of the Lagrangian multiplier in video coding
论文作者
论文摘要
在过去的十年中,在每张剪辑中而不是人均优化转码参数方面取得了重大发展。在我们最近的工作中,我们对速率受控压缩的拉格朗日乘数进行了每盘乘数,从而在使用HEVC的视频中产生了大约2 \%的BD速率改进。但是,在视频流应用程序中,重点是优化特定比特率的速率/失真折衷,而不是在一系列性能中平均而不是。我们在以前的工作中观察到,特定的乘数可能会在一定范围的比特率上改善BD利率,但不超过整个范围。在整个范围内使用不同的参数将改善总体上的收益。因此,在这里,我们提出了一个框架,用于在各种比特率的范围内选择最佳的拉格朗日乘数。实际上,我们试图在一个剪辑中找到跨比特率和失真的优势增益。在提出的实验中,我们采用直接优化技术来估计该拉格朗日参数路径约2,000个视频片段。这些剪辑主要来自YouTube-UGC数据集。我们优化了用于比特率的节省以及失真指标(PSNR,SSIM)。
In the past ten years there have been significant developments in optimization of transcoding parameters on a per-clip rather than per-genre basis. In our recent work we have presented per-clip optimization for the Lagrangian multiplier in Rate controlled compression, which yielded BD-Rate improvements of approximately 2\% across a corpus of videos using HEVC. However, in a video streaming application, the focus is on optimizing the rate/distortion tradeoff at a particular bitrate and not on average across a range of performance. We observed in previous work that a particular multiplier might give BD rate improvements over a certain range of bitrates, but not the entire range. Using different parameters across the range would improve gains overall. Therefore here we present a framework for choosing the best Lagrangian multiplier on a per-operating point basis across a range of bitrates. In effect, we are trying to find the para-optimal gain across bitrate and distortion for a single clip. In the experiments presented we employ direct optimization techniques to estimate this Lagrangian parameter path approximately 2,000 video clips. The clips are primarily from the YouTube-UGC dataset. We optimize both for bitrate savings as well as distortion metrics (PSNR, SSIM).