Request: Intel SVT encoders.

[alatteri]

The Intel SVT encoders offer significant performance improvements. Would be great to see them integrated into the compile.

[stoyanovgeorge]

I have managed to compile svt_av1 and svt_hevc, even though they require applying a patch in order for ffmpeg to be able to detect the --enable-libsvthevc and --enable-libsvtav1 flags. Unfortunately, I wasn't able to compile svt_vp9 from source on Ubuntu 18.04. I will update later on the repo and add instructions on how to do it. It will mostly require to uncomment a line in the compilation.sh . It will also require to export manually the PKG_CONFIG_PATH and LD_LIBRARY_PATH after the installation, I didn't find a way to export them in a BASH script. I will follow up when the documentation is in the repo.