[FFmpeg-devel] OpenCV filter should be built as C++, and C builds fail since OpenCV 3.4.1

wm4 nfxjfg at googlemail.com
Tue Mar 20 18:04:30 EET 2018

On Mon, 19 Mar 2018 19:01:49 +0200
Jan Ekström <jeebjp at gmail.com> wrote:

> On Mon, Mar 19, 2018 at 6:28 PM, wm4 <nfxjfg at googlemail.com> wrote:
> > On Mon, 19 Mar 2018 09:35:22 -0400
> > Jeff Cook <jeff.cook at strongstrata.com> wrote:
> >  
> >> Hello,
> >>
> >> Please see the bug report at https://github.com/opencv/opencv/issues/10963 , which discusses OpenCV's failure to build as pure C since upstream version 3.4.1, and also discusses how all modules that use OpenCV 2 or later should be compiled as C++ to avoid esoteric issues and serious breakages.
> >>
> >> There is a large amount of discussion there that I don't want to needlessly duplicate and/or badly summarize here, but the high-level overview is that it seems that ffmpeg will need to convert avfilter/vf_opencv.c to build as C++ if the OpenCV filter is going to continue to work. The current situation is affecting many prominent projects like VLC.  
> >
> > FFmpeg is a C project, and due to missing features in C++ (initializers)
> > it's very awkward to build things in C++ mode. Can't OpenCV just fix
> > their stuff.
> >  
> https://github.com/opencv/opencv/issues/8438#issuecomment-288638915
> tl;dr
> They're breaking C compatibility knowingly. If and only if we want to

OK, can we just drop OpenCV support?
Or require a C wrapper lib?

More information about the ffmpeg-devel mailing list