very excited with new updates 10 february ffmpeg-3 Added :=)
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I know I use a lot of those optional dependencies in my builds of ffmpeg, so I really hope that SBo makes an exception for ffmpeg to stay on there after the next version of Slackware is released. It is much easier to manage it through the various SBo building software rather than doing it manually after grabbing the source from your favorite Slackware mirror.
But, one nice thing is ffmpeg is built automatically with opencl support as well
Because of the patents and the big amount of optional dependencies, the ffmpeg package will surely see a lot of rebuild by the users.
That's why I'd like to suggest a patch to help people rebuilding the package. The stock ffmpeg configure file is quite brain dead and it can't find dependencies by itself so we have a long list of manual switches in the slackbuild.
My patch add some automation using the pkg-config "--exists" option. That's actually a very easy to use and portable way of detection. Not all dependencies can be detected by pkg-config, but I tested successfully on 19 libs (more than half of the current list).
I added a single FEATURE switch around the 19 autodetected libs if people don't want the optional deps. The other libs still need an env variable.
It's possible that more libs can be added in the pkg-config autodetected tests but I couldn't test them because I don't use them.
So you can maybe contribute by testing the other libs and improving the patch. Thanks!