Well, I don't think having multiple versions installed in parallel is a
supported configuration, or even that useful?
Anyway, the rules are as follows, assuming I'm remembering correctly:
Open-source libvdpau.so* loads /usr/lib/vdpau/libvdpau_${driver}.so.1
(which is the defined canonical location now) and if that doesn't work,
falls back to libvdpau_${driver}.so via ldconfig path. This fallback
mechanism is because open-source libvdpau.so* needs to support both
recent NVIDIA driver release (which place files into /usr/lib/vdpau) and
older releases (which place files into /usr/lib).
The libvdpau.so* shipped with the NVIDIA binary driver only searches for
libvdpau_${driver}.so (via ldconfig path) since the binary driver
installer always installs the library, or a link to it, into
/usr/lib/libvdpau_nvidia.so. Since /usr/lib may be named /usr/lib,
/usr/lib32, /usr/lib64, ..., and the single binary we ship must work on
all distros, it's simpler to rely on ldconfig path for our binary
libvdpau.so*.
In simpler terms, what you propose sounds like it should work.
--
nvidia-180-libvdpau packages both libvdpau and libvdpau_nvidia
https://bugs.launchpad.net/bugs/432172
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