I guess it's supported
gst-inspect-1.0 x265
Plugin Details:
Name x265
Description x265-based H265 plugins
Filename /usr/lib64/gstreamer-1.0/libgstx265.so
Version 1.8.3
License GPL
Source module gst-plugins-bad
Source release date 2016-08-19
Binary package gst-plugins-bad 1.0 rpmfusion rpm
Origin
URL http://rpmfusion.org/
x265enc: x265enc
1 features:
+-- 1 elements