Fixes#98769.
Important changes from https://gstreamer.freedesktop.org/releases/1.18/:
* `gst-validate` was renamed to `gst-devtools` upstream:
> * the `gst-validate` tarball has been superseded by
> the `gst-devtools` tarball for consistency with the git module name.
* `gst-python` is now Python 3 only:
> * Python 2.x is no longer supported
During the 1.14 -> 1.15 upgrade, lots of stuff stopped working because
gstreamer changed what features are enabled by default and which ones are
automatically turned on/off via pkgconfig dependency detection.
This resulted in the `gstreamer` ("core" attribute in nixpkgs) package
to have only 15 of its previous 163 build targets enabled, and downstream
packages breaking correspondingly.
To ease maintainability and to ensure users will find the expected features
available (and when not, will see in the nix file why not), we now pass
the `-Dauto_features=enabled` Meson build flag to all gstreamer builds,
which sets all `auto` dependencies to `enabled`, and we explicitly disable
those that we can't build.
This means in particular that `gst-plugins-bad` now has vastly more integrations
(namely all for which nixpkgs has libraries available).
It seems that all uses of `libva` it in nixpkgs except `mesa` and itself actually
either will gain from using `libva-full` instead of `libva-minimal` by default
or simply won't care.
(And while at it, gst-vaapi 0.6.0 -> 0.6.1.)
* gst-editing-services grew additional build time dependencies, flex and
perl.
* gst-libav switched from libav to ffmpeg as "libav" provider, see
http://gstreamer.freedesktop.org/releases/1.6/.
Without using ffmpeg, one may hit issues such as this (which I
initially did):
(gst-plugin-scanner:19751): GStreamer-WARNING **: Failed to load plugin '/nix/store/0wgpq2yx9wrkp2mh4rn1c7zbiq2bqa2l-gst-libav-1.6.1/lib/gstreamer-1.0/libgstlibav.so':
/nix/store/0wgpq2yx9wrkp2mh4rn1c7zbiq2bqa2l-gst-libav-1.6.1/lib/gstreamer-1.0/libgstlibav.so: undefined symbol: av_frame_get_sample_rate
This will make callPackage work with gst.
* Rename gstCamelCase to gst_with_underscores.
* Add compatibility attributes.
svn path=/nixpkgs/trunk/; revision=33078
* Allow gst-plugins-base to be built with a minimal set of dependencies
(to prevent dependency bloat in Xfce).
* Updated gstreamer.
svn path=/nixpkgs/trunk/; revision=24207
I updated gstreamer too, because this phonon was not finding a header file. As that
did not fix much the phonon build, I helped the generic builder with NIX_CFLAGS_COMPILER for
phonon to find the proper header files. Either the phonon cmake scripts don't find properly
the gstreamer plugins header file, or we install gstreamer in a strange way.
svn path=/nixpkgs/trunk/; revision=19974
