Package: x264 Version: 2:0.142.2389+git956c8d8-5 Can you add a script with the name "x264-10b" and the followingcontent to /usr/bin, to make it a little easier to work with the 10bit library?
#!/bin/sh LD_PRELOAD=/usr/lib/x86_64-linux-gnu/x264-10bit/libx264.so.142 x264 "$@"