This github is 5 years old and on the front page of HN. The wikipedia page has more information than this thing.

https://en.wikipedia.org/wiki/AV1

Are there any FPGA implementations of the AV1 codec, and if so, how do the resource requirements compare to HEVC?

For those of you who are new to movie codecs, here is some info that might be useful:

roughly, videos are not streams of images, one after the other (well motion jpeg is, but ignore that) They are "key frames" ie full images, then a set of blocks with some vectors that move those blocks around to make a moving image. So you'll see something like b, i and p frames, each have a different role for making either a full image from which the next frames re-constructed, or the blocks that make the in-between frames.