AOMedia Video 1 (AV1) is an open, royalty-free video coding format initially designed for video transmissions over the Internet. It was developed as a successor to VP9 by the Alliance for Open Media (AOMedia), a consortium founded in 2015 that includes semiconductor firms, video on demand providers, video content producers, software development companies and web browser vendors. The AV1 bitstream specification includes a reference video codec. In 2018, Facebook conducted testing that approximated real world conditions, and the AV1 reference encoder achieved 34%, 46.2% and 50.3% higher data compression than libvpx-vp9, x264 high profile, and x264 main profile respectively.
Like VP9, but unlike H.264/AVC and HEVC, AV1 has a royalty-free licensing model that does not hinder adoption in open-source projects.
AVIF is an image file format that uses AV1 compression algorithms.
AV1 defines three profiles for decoders which are Main, High, and Professional. The Main profile allows for a bit depth of 8- or 10-bits per sample with 4:0:0 (greyscale) and 4:2:0 (quarter) chroma sampling. The High profile further adds support for 4:4:4 chroma sampling (no subsampling). The Professional profile extends capabilities to full support for 4:0:0, 4:2:0, 4:2:2 (half) and 4:4:4 chroma sub-sampling with 8, 10 and 12 bit color depths.
|Profile||Bit depth||Chroma subsampling|