Re: [FFmpeg-devel] [PATCH] lavc/libopenh264: Drop openh264 runtime version checks

["Martin Storsjö" <martin@martin.st>]

On Fri, 8 Dec 2023, Kalev Lember wrote:

> As for dlopening, I think instead of version checks, it would make sense to
> try to dlsym() all of the actual required symbols, and error out in init if
> anything is missing. That should make it all super flexible and resilient to
> e.g. struct size changes that would normally be an ABI change.

How would that help, if e.g. the SEncParamExt struct in svc_encode_init 
would change layout/size - which part would notice that change?

> In Fedora, we are planning on changing things up a bit and starting to build
> packages that link with openh264 against the "noopenh264" stub
> implementation and replacing it at runtime with the actual openh264 library
> downloaded directly from Cisco. Flathub flatpak runtimes already use that
> approach and it seems to work well there. This should hopefully let us take
> advantage of the Cisco patent grant and fit well in the build system
> architecture that we have.

Ah, interesting, that sounds like a reasonable way to take advantage of 
that patent grant without having everybody to do the dlopening.

// Martin

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