The majority of internet traffic is video content. This drives the demand for video compression in order to deliver high quality video at low target bitrates. This paper investigates the impact of adjusting the rate distortion equation on compression performance. An constant of proportionality, k, is used to modify the Lagrange multiplier used in H.265 (HEVC). Direct optimisation methods are deployed to maximise BD-Rate improvement for a particular clip. This leads to up to 21% BD-Rate improvement for an individual clip. Furthermore we use a more realistic corpus of material provided by YouTube. The results show that direct optimisation using BD-rate as the objective function can lead to further gains in bitrate savings that are not available with previous approaches.
翻译：大部分互联网流量都是视频内容。 这驱动了视频压缩需求, 以便以低目标比特率提供高质量的视频。 本文调查了调整比例扭曲方程式对压缩性能的影响。 k, 用于修改 H.265 (HEVC) 中使用的拉格兰格乘数的常数 。 使用直接优化方法, 使特定剪辑的BD- Rate改进最大化。 这导致个人剪辑的BD- Rate改进高达21% 。 此外, 我们使用YouTube提供的更现实的材料。 结果显示, 使用BD- rate作为客观功能的直接优化可以进一步增加先前方法无法提供的比特率节约。
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