Re: [FFmpeg-devel] [PATCH v2 0/3] hwcontext_vaapi: dlopen libva-x11 and libva-drm

[Emil Velikov <emil.l.velikov@gmail.com>]

On Tue, 19 Jul 2022 at 19:16, Nicolas George <george@nsup.org> wrote:
>
> Emil Velikov (12022-07-19):
> > As you may know the libva* set of libraries share an internal ABI
> > between them. In a resent libva commit, the va_fool API was removed.
> >
> > Thus if one is to mix different versions of libva.so and libva-x11.so
> > they will get an error, leading to a crash of the whole stack.
> >
> > The simple solution is
>
> ... a configure check.
>
> If the person who installs replaces a library with another, it is their
> responsibility to check they are compatible.
>

While I wholeheartedly agree, it's not so easy to enforce compile time
decisions at runtime. In the past, I have debugged and reported issues
where Linux distributions do not enforce the above.

We do have the typical Linux distribution model (where we have dozens
upon distros) and other distribution models. IMHO checking each
instance and combination doesn't scale. We could bring awareness to
the issue in say distribution/workflow X, which sadly may come as
finger-pointing and thus alienating.

Hope that makes sense and the team is willing to consider the extra 90
lines worth of code.

Thanks in advance
Emil
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