Update - I’ve just tried piping from TVAI’s ffmpeg to another downloaded ffmpeg built with libx264 and libx265 and it works! Just edit the TVAI export command by replacing everything after “-c:v” as in the following example for libx264.
ffmpeg … “-c:v” rawvideo -c:a copy -f: nut pipe:1 | /Users/Andy/Downloads/ffmpeg -i - -vcodec libx264 -acodec copy -vb 8000k -f: mp4 /Users/Andy/Desktop/pipeout.mp4
This was done on my Mac but the same principle should hopefully work for Windows.
Thanks.
Andy