https://salivity.github.io/av1/article/av-1-dynamic-resolution-scaling-without-keyframes
AV1 Dynamic Resolution Scaling Without Keyframes - av1
Yes, an AV1 encoder can downscale—and upscale—video resolution mid-stream without emitting a keyframe. This capability is made possible by a native AV1 feature...
dynamic resolution scalingwithoutkeyframes