Finally, there are a couple of x265 builds that accept stdin "-".
http://forum.videohelp.com/attachments/208...ccac3a7d3622.7z
https://x265.cc/
Here is the working command argument for Virtualdub 1.10.3 external encoder...
--input-res %(width)x%(height) --fps %(fps) --q 24 --keyint 40 --max-merge 3 --hash 1 --no-rect --wpp --tu-intra-depth 1 --tu-inter-depth 1 --no-tskip --frame-threads 4 - -o "%(tempvideofile)"
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