[ksec]

From the video I was expecting even higher compression than HEIF, but > 60% over JPEG-1 seems to be about the same as HEIF.

And what are the downside? Whenever something sounds too good to be true it often means we are overlooking something.

[JyrkiAlakuijala]

There is a Japanese independent (simple) comparison between av1, bpg, WebP and pik for use in photo compression. Pik won it. JPEG XL is an improved from pik.

https://qiita.com/fg11894