[FFmpeg-devel] [PATCH 3/3] configure: check avisynth header version

[Helmut K. C. Tessarek]

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On 2022-02-16 19:55, Stephen Hutchinson wrote:
> FFmpeg dlopens AviSynth, it only needs the headers and doesn't try to
> link it.  It has never linked to AviSynth.

This I find strange. dlopen is rather useless when you create static
binaries unless you want to ship X diffreent dylibs or SOs with the binary.

There's also no static version of frei0r. Very annoying.

> If 3.5.1 is working (and by that I assume you mean you're opening a
> Version() script in FFplay and it's showing you the video clip with the
> version and copyright information), then libavisynth.dylib is somewhere
> on your DYLD_LIBRARY_PATH, and you could just as easily set
> DYLD_LIBRARY_PATH to the /usr/lib directory in the -filesonly package and
> that Version() script will start reporting 3.7.1 instead.

It's definitely not working, since I don't ship any dylibs. I always thought
3.5.1 li9nked a static lib, but I checked. It does not.

Even if I wanted to I couldn't ship any dylibs, since I can't build
AviSynthPlus on macOS 10.14.

> At this point, just use latest git, since that's where the HEADERS_ONLY
> fix resides: And HEADERS_ONLY is exactly what it says on the tin: it only
> sets CMake to install the headers, and stops it from building the
> library, which wouldn't get linked to anyway.

Ok, this worked. I was able to compile ffmpeg again. At least now I know
that avisynth won't work with static banaries unless people install dylibs
themselves.

- -- 
regards Helmut K. C. Tessarek              KeyID 0x172380A011EF4944
Key fingerprint = 8A55 70C1 BD85 D34E ADBC 386C 1723 80A0 11EF 4944

/*
   Thou shalt not follow the NULL pointer for chaos and madness
   await thee at its end.
*/
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