AV1视频压缩格式是由开放多媒体联盟 (AOMedia)开发，并于2018年初最终确定。AV1具有功能强大的编码算法，与其前身VP9相比，AV1的压缩性能提升了30%以上。但是，AV1编码器的复杂性也远高于VP9编码器。所以，在AV1格式确定以后，我们的主要目标是优化编码器，使其产品化。在这里，我们主要和大家讨论libaom AV1编码器中所采用的优化技术。目前，AV1编码器的复杂程度已经降到与VP9编码器相当，而且还能节省22%的比特率。libaom AV1为流媒体视频压缩（例如：YouTube）提供了一个绝佳的方案，一方面减少了编码成本，另一方面极大地节省了带宽以及存储的成本。此外，libaom AV1也为实时通讯 (RTC)提供了超级快速的实时编码器。AV1实时编码器已经用于谷歌 Duo APP 中，这也使得超低比特率的视频会议成为可能。
Google embarked on the WebM Project in 2010 to develop open source, royalty-free video codecs designed specifically for media on the Web. The second generation codec released by the WebM project, VP9, is currently served by YouTube, and enjoys billions of views per day. Realizing the need for even greater compression efficiency and to cope with the ever-increasing demand for video on the web, Google joined a consortium of major tech companies called the Alliance for Open Media in 2016, and started an ambitious project to develop a next generation royalty-free codec AV1. AV1 was finalized in June 2018, and achieves about an one-third reduction in bandwidth over current generation codecs VP9 and HEVC at a practical hardware and software complexity. This makes AV1 the most advanced video codec available today that is also royalty-free. In this talk, I will provide a technical overview of the most innovative coding tools in AV1, followed by coding results on standard test sets compared against VP9 and HEVC.