AOMedia Video 1 (AV1) is a libre, royalty-free video coding format initially designed for video transmissions over the Internet. It was developed as a successor to VP9 by the Alliance for Open Media.
I am testing this fancy, libre and new av1 video format on Librem 5, as the resulted librem 5 it capable to play this AV1 format very smooth by using 45 % of CPU under gstreamer 1.21. I testing too hard accel vp9 on gstreamer 1.21 and linux 5.17.