Checked into GIT the addition of libsvtav1 as an optional build library based on all of the work of Andrew, Andrea, and Terje with all of their testing. Includes the 2 corrected av1_svt profiles. I did add a small patch to libsvtav1 since I was able to build it on cmake 3.12, although its CMakeLists.txt said cmake 3.16 was required - it built on Fedora 29 which has cmake 3.12. It is not built by default due to errors when rendering as shown below. However, I will build the appimages with it included. Svt[warn]: Failed to set thread priority: Invalid argument
FFStream::encode_frame: encode failed. file: /tmp/sv6.webm err: Resource temporarily unavailable FFMPEG::mux_video err: Operation not permitted FFStream::encode_frame: encode failed.
I will open a BT on this in case someone comes along later and fixes the problem. FFmpeg has several patches against it which was developed over time and it is likely another one is needed to address this. Also, like Andrea, I found some audio to be bad, but when I chose opus for webm (not opus/ffmpeg), it seemed good.