Previously, having the "Encoding speed" set to "slowest" would choose libaom-av1 first and librav1e second. This change makes Blender choose librav1e first (and has a fallback to whatever other AV1 codec is available if librav1e is not installed). Addresses /T103849 on systems where librav1e codec available. Reviewed By: sergey, ISS Maniphest Tasks: T103849 Differential Revision: https://developer.blender.org/D17002