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The issue is that we rely on `decodebin::autoplug-select` to `SKIP`
unwanted pads, that signal was first provided to select factories during
autoplugin, not totally thought to avoid exposing pads. For streams
muxed directly in raw, decodebin has nothing to plug after the demuxer
and the pad is exposed right away, meaning that we do not have any
chance to avoid that pad to be exposed. This patch takes that limitation
into account and checks the stream ID of the pads exposed by decodebin
before exposing them itself, so we end up using the right pad even if
more are uselessly exposed by decodebin.

Fixes #126

Part-of: <!222>

Avoiding not negotiated errors in specific cases.

Part-of: <!225>

We were unreffing something we were not owning

Part-of: <!224>

This is the same fix that was applied in gst-plugins-good in
gst-plugins-good!603
and fixes the testsuite running in gst-build.

Part-of: <!219>

Part-of: <!209>

This makes it easier to do development with MSVC by making it warn
on common issues that GCC/Clang error out for in our CI configuration.

Continuation from gst-build!223

Part-of: <!220>

Fix a case where initialisation fails without setting
the passed-in GError and the caller assumes it will be
set, and add a guard to catch the condition in case it
happens again in the future.

Part-of: <!217>

Static build fails since version 1.17.1 and
1e488d43
on:

FAILED: tools/ges-launch-1.0
/srv/storage/autobuild/run/instance-2/output-1/host/bin/arm-linux-gcc  -o tools/ges-launch-1.0 tools/ges-launch-1.0.p/ges-validate.c.o tools/ges-launch-1.0.p/ges-launch.c.o tools/ges-launch-1.0.p/ges-launcher.c.o tools/ges-launch-1.0.p/utils.c.o -Wl,--as-needed -Wl,--no-undefined -Wl,-O1 -Wl,-Bsymbolic-functions -static -Wl,--start-group ges/libges-1.0.a /srv/storage/autobuild/run/instance-2/output-1/host/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libgstreamer-1.0.a /srv/storage/autobuild/run/instance-2/output-1/host/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libgobject-2.0.a /srv/storage/autobuild/run/instance-2/output-1/host/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libglib-2.0.a -pthread /srv/storage/autobuild/run/instance-2/output-1/host/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libpcre.a /srv/storage/autobuild/run/instance-2/output-1/host/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libffi.a /srv/storage/autobuild/run/instance-2/output-1/host/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libgmodule-2.0.a /srv/storage/autobuild/run/instance-2/output-1/host/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libgstbase-1.0.a /srv/storage/autobuild/run/instance-2/output-1/host/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libgstvideo-1.0.a /srv/storage/autobuild/run/instance-2/output-1/host/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libgstpbutils-1.0.a /srv/storage/autobuild/run/instance-2/output-1/host/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libgstaudio-1.0.a /srv/storage/autobuild/run/instance-2/output-1/host/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libz.a /srv/storage/autobuild/run/instance-2/output-1/host/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libgsttag-1.0.a /srv/storage/autobuild/run/instance-2/output-1/host/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libgstcontroller-1.0.a /srv/storage/autobuild/run/instance-2/output-1/host/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libgio-2.0.a /srv/storage/autobuild/run/instance-2/output-1/host/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libmount.a /srv/storage/autobuild/run/instance-2/output-1/host/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libblkid.a -lm -Wl,--end-group
/srv/storage/autobuild/run/instance-2/output-1/host/opt/ext-toolchain/bin/../lib/gcc/arm-buildroot-linux-uclibcgnueabi/8.3.0/../../../../arm-buildroot-linux-uclibcgnueabi/bin/ld: /srv/storage/autobuild/run/instance-2/output-1/host/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libc.a(err.os): in function `warn':
err.c:(.text+0x1d8): multiple definition of `warn'; tools/ges-launch-1.0.p/utils.c.o:utils.c:(.text+0x9bc): first defined here

So rename warn function to ges_warn
Also prefix ok, print and printerr function by ges_ for consistancy and
run gst-indent on tools/ges-launcher.c

Fixes:
 - http://autobuild.buildroot.org/results/2a528a1185644f5b23d26eb3f2b342e99aa1e493Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Part-of: <!216>

Actually check the version constraint when looking for the glib
dependency.

The version check will make meson use the fallback dependency when the
one from the system is not recent enough, and eventually make the build
succeed even on some older systems like Ubuntu 16.04.

Part-of: <!212>

In order to support the symbol g_enum_to_string in various
project using GStreamer ( gst-validate etc.), the glib minimum
version should be 2.56.0.

Remove compat code as glib requirement
is now > 2.56

Version used by Ubuntu 18.04 LTS

Part-of: <!215>

Otherwise we loose the configuration of the auto transition, and
it is not required at all in any case.

Fixes https://gitlab.gnome.org/GNOME/pitivi/-/issues/2380

Part-of: <!208>

Passed unnoticed because we built against GstValidate

Fixes #119

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And deprecate old style accessors.

Part-of: <!207>

Part-of: <!210>

Part of: gst-plugins-base!796

Fixes #118

Part-of: <!206>

Part-of: <!204>

So that it tries to negotiate with alpha and the alpha channel is
dropped as late as possible in the pipeline.

The compositor is able to do video conversion internally in any case
so having a videoconvert before it is useless.

Part-of: <!204>

Making it simpler to debug

Part-of: <!204>

Part-of: <!204>

Part-of: <!204>

Part-of: <!204>

Since aggregator introduced queueing in its sinkpads the way we set
properties on the pads is incorrect as it doesn't take it into account.
This fixes the issue by using the newly introduced `samples-selected`
signal in aggregator to set the properties right before the compositing
is done.

Also require the compositor we use to be an aggregator.

And add a validate test for it.

Part-of: <!204>

Part-of: <!204>

Part-of: <!198>

Part-of: <!198>

Most user do not need to select several tracks for a single
TrackElement and this signal is not binding friendly so
this is adding a simpler, more user and binding friendly version

Part-of: <!198>

Part-of: <!198>

Part-of: <!198>

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And make it yield as in other modules

Part-of: <!198>

Trying to get the best encoding profile for smart rendering when
the user didn't specify anything.

Part-of: <!198>

Smart rendering has been broken since, mostly forever, but some code
was there pretending it was supported... let's try to stop pretending.

We now keep track of the smart rendering state in the timeline, track
and sources to be able to:

 * tell decodebin to stop plugging more (decoding elements) as soon as
   downstream supports the format.

 * avoid plugging converters after the source element when smart
   rendering.

Part-of: <!198>

Otherwise `gst-validate-launcher` can get veeery noisy

Part-of: <!198>

Part-of: <!198>