Good news! I got to compile a highly optimized ffmpeg binary from a current git, with XU4 tweaks, that is able to encode two simultaneous 1080p@25, as long as the source bitrate is not excessive.   You can download and give it a try from here. It is completely static, so you can install it on any distro. It will install the binary in "/opt/ffmpeg-xu4/bin/ffmpeg", and a symlink "/usr/local/bin/ffmpeg-xu4". Therefore, it can be installed along the system ffmpeg without conflicts.
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