AV1 Version 1.0.0 with errata 1 for AVIF

This tag does not indicate or imply any change to AV1 bitstream or
decoding behavior since v1.0.0-errata1, rather it indicates this
library can also be used for encoding and decoding AVIF.

AV1 Version 1.0.0 with errata 1

AOMedia Codec Workgroup Approved version 1.0

2016-04-07 v0.1.0 "AOMedia Codec 1"

just an early checkpoint, not an official release; the bitstream is
non-final and highly experimental.