https://www.guru3d.com/news-story/av1-video-codec-specification-presented-will-save-bandwidth.html
https://aomedia.org/the-alliance-for-open-media-kickstarts-video-innovation-era-with-av1-release/
AV1 is a royalty free video codec competing with the non-free HEVC/H.265 , despite being free it should offer a 30% improvement over HEVC.
Should be great for all of you on data caps!