Mozilla loves AV1 for two reasons: AV1 is royalty-free, so anyone can use it free of charge. Software companies can use it to build video streaming into their applications. Web developers can build their own video players for their sites. It can open up business opportunities, and remove barriers to entry for entrepreneurs, artists, and regular people. Most importantly, a royalty-free codec can help keep high-quality video affordable for everyone. The second reason we love AV1 is that it delivers better compression technology than even high-efficiency codecs - about 30% better, according to a Moscow State University study. For companies, that translates to smaller video files that are faster and cheaper to transmit and take up less storage space in their data centers. For the rest of us, we’ll have access to gorgeous, high-definition video through the sites and services we already know and love.

https://blog.mozilla.org/blog/2018/07/11/royalty-free-web-video-codecs/ https://aomedia.org