providers, video content producers, software development companies and web browser vendors. The AV1 bitstream specification includes a reference video codec. In 2018, Facebook re-encoded 400 compressed Facebook videos with AV1, VP9, and x264 and found AV1 delivered around 34% lower bitrates than VP9 and about 50% lower than x264 at similar visual quality, though encoding was much slower.

Like VP9, but unlike H.264