Last year, the Alliance for Open Media released its next-generation video codec AV1. It achieves better compression than proprietary competitors, while its patents can be licensed via a royalty-free, open-source friendly license. With a broad array of industry support including all major browser vendors, many hardware partners, internet streaming and video conferencing providers, we think this is our best chance yet to create a successful video codec that achieves wide deployment. However publishing the AV1 standard is just the first step towards broad adoption. Now that the bitstream is finalized research has shifted to encoder algorithms for use in real-world, production environments. The Rust AV1 Encoder (rav1e) project at Mozilla is a clean room AV1 implementation targeting a variety of operating points. Where the standardization effort focused on tools that improved objective metrics, the rav1e project is focused on algorithms that improve perceived video quality.