AV1 @ Scale: 电影颗粒合成，觉醒
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Li-Heng Chen, Andrey Norkin, Liwei Guo, Zhi Li, Agata Opalach and Anush Moorthy
Li-Heng Chen, Andrey Norkin, Liwei Guo, Zhi Li, Agata Opalach 和 Anush Moorthy
Picture this: you’re watching a classic film, and the subtle dance of film grain adds a layer of authenticity and nostalgia to every scene. This grain, formed from tiny particles during the film’s development, is more than just a visual effect. It plays a key role in storytelling by enhancing the film’s depth and contributing to its realism. However, film grain is as elusive as it is beautiful. Its random nature makes it notoriously difficult to compress. Traditional compression algorithms struggle to manage it, often forcing a choice between preserving the grain and reducing file size.
想象一下：你正在观看一部经典电影，细腻的胶卷颗粒为每个场景增添了一层真实性和怀旧感。 这种颗粒是在胶卷开发过程中由微小颗粒形成的，不仅仅是一种视觉效果。它在讲故事中发挥着关键作用，通过增强电影的深度并贡献于其现实感。然而，胶卷颗粒既美丽又难以捉摸。它的随机特性使得压缩变得极其困难。传统的压缩算法难以处理它，常常迫使人们在保留颗粒和减少文件大小之间做出选择。
In the digital age, noise remains a ubiquitous element in video content. Camera sensor noise introduces its own characteristics, while filmmakers often add intentional grain during post-production to evoke mood or a vintage feel. These elements create a visually rich experience that tests conventional compression methods.
在数字时代，噪声仍然是视频内容中普遍存在的元素。相机传感器噪声引入了其自身的特性，而电影制作人通常在后期制作中添加故意的颗粒，以唤起情绪或复古的感觉。这些元素创造了一个视觉丰富的体验，考验着传统的压缩方法。
We’re giving members globally a transformed streaming experience with the recent rollout of AV1 Film Grain Synthesis (FGS) streams. While FGS has been part of the AV1 standard since its inception, we only enabled it for a limited number of titles during our initial launch of the AV1 codec in 2021. Now, we’re enabling this innovative technology at scale, leveraging it to preserve the artistic integrity of film grain while optimizing data efficie...