xml-formatter: Add support for metadata on sources

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/260>

marker-list: Add flags (de)serialization

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/260>

ges: freeze commit during render

In render mode, do not commit the timeline
as the position can be invalid and lead to
missing frames.

Fixes #136

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/262>

timeline: Check if metadata value holds object on marker snapping

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/263>

timeline: Implement snapping to markers

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/259>

Check mandatory ClockTime arguments

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/258>

Use g_memdup2() where available and add fallback for older GLib versions

Size is constant here, so no problem in any case, but g_memdup() is
now deprecated and we don't want deprecation warnings.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/257>

Back to development

Release 1.19.1

uriclip: Add an error message when creating a clip failed

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/252>

examples: c: Sensibly simplify the simple example

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/252>

examples: python: Simplify the simple example

We shouldn't show assets usage in the simplest example we have
as it is useful for more advanced use cases.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/252>

tests: Update expectation files with sorted structure fields

tests/check: Use fake{audio,video}sink

The tests already depend on -bad, so this should be OK.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/254>

launcher: Switch to fake{audio,video}sink

Simplifies the code a bit, though introducing runtime dependency on -bad.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/254>

structure-interface: Convert fields type as much as possible

Since 60922c02889cf1ebcfaca4501936be689c342e01 we force string in the
command line parser which broke setting layers on clips for example

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/253>

validate: Add support to check properties of object properties

And recursively

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/253>

smart-mixer: Add support for d3d11compositor and glvideomixer

Some hardware compositor elements (d3d11compositor and glvideomixer)
consist of wrapper bin with internal mixer element.
So, we need special handling for such elements.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/242>

framepositioner: Install operator property only when compositor is used

Other compositor/mixer elements might not have the property. For instance,
d3d11compositor and glvideomixer define graphics API specific blending
properties, instead of simple "operator" one.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/242>

xml-formatter: Write xml directly to file

Skip allocation of temp buffer (which was undersized).

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/250>

tests: Run ges-launch tests non-interactively

It's not needed for the tests and fixes an occasional issue where
the terminal is left in -echo mode.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/248>

track-element: Fix and cleanup annotations

Making the class subclass able by bindings

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/231>

ges: Move GESVideo/AudioSource::create_source to GESSource

Deprecating the old variants which were not introspectable
and cleaning a bit the API.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/231>

Use gst_element_request_pad_simple...

Instead of the deprecated gst_element_get_request_pad.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/240>

ges: Port to gst_print*

Sync with gst-launch, as g_print* will print broken string on Windows.
See also
https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/258

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/245>

framepositioner: Allow ANY caps features

framepositioner will not touch raw video data and therefore should
be able to accept ANY caps features

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/243>

gstframepositioner: fix operator magic number

In gst_frame_positioner_init, there was the magic number 1
when assigning the default value of the operator. Now it
has the default value for the operator pulled from the
compositor.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/241>

gstframepositioner: added 'operator' property

The 'operator' property was added to gstframepositioner so that
blending modes in the compositor could be accessed. This was done
by accessing the pad of the compositor class, and referencing the
'operator' property in that pad. Getters and Setters were also
created so that the 'operator' could be accessed by software that
is based on GES, such as Pitivi.

Related to but does not close Issue
https://gitlab.gnome.org/GNOME/pitivi/-/issues/2313

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/236>

framepositioner: Fix runtime warning

GstCaps is not a GObject!

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/238>

titleclip: Expose draw-shadow child property

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/235>

gst: don't use volatile to mean atomic

volatile is not sufficient to provide atomic guarantees and real atomics
should be used instead.  GCC 11 has started warning about using volatile
with atomic operations.

https://gitlab.gnome.org/GNOME/glib/-/merge_requests/1719

Discovered in https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/issues/868

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/234>

ges: doc: Fix wrong vmethod links

group: Use proper group constructor

Otherwise we might en up having a group which is not backed by any asset
leading to possible assertion as this should never happen (see
https://gitlab.gnome.org/GNOME/pitivi/-/issues/2526)

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/232>

Update check_keyframes_in_compositor_two_sources

Update the validate expectation for videoconvert caps changes in
https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/1033

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/229>

project: Plug a leak

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/227>

xml-formatter: Properly report error parsing restriction caps

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/227>

test: Check clip positioning works when specifying track size

Make use of the new 'timeline specification' support in .validatetest
files.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/227>

tools: Fix some naming

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/227>

tools: Reindent options

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/227>

launch: Add encoding profiles to the project

So it is serialized on `--save`

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/227>

validate: Handle passing timeline desc in .validatetest files

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/227>

plugin: Fix `is-ges-timeline` registration

We need to register it for all subclasses.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/227>

command-line-formatter: Stop uselessly looping over options

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/227>

command-line-formatter: Add a way to format timelines using the format

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/227>

ges: Use a `ges:` uri to define timeline from description

This way the command line formatter actually uses an URI and not
an ugly hack where were passing a random string instead of an URI.
This also allows the `gessrc` element to handle timelines described
in its URI meaning that you can now use, for example:

   gst-play-1.0 "ges:+test-clip blue d=4.0

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/227>

ges: Add keyframe support to the command line formatter

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/227>

structured-interface: Move set_control_source from ges-validate

So it can be reused in the command line formatter.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/227>

structured-interface: Factor out method to get element to set property

Used to set properties or keyframes

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/227>

command-line-formatter: Reindent command line options array

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/227>

formatter: Use the new `GstEncodingProfile:element-properties` property

Cleaning up the code and making everything simpler.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/227>

ges: Minor debug logging level and typo fixes

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/227>

command-line-formatter: Add track management to timeline description

Instead of having it all handled by the tool, this way we can
set the restriction before clips are added to the timeline,
leading to better behavior in term of video images placement
in the scene.

Without that we would have the clips positioned before setting the
restriction caps which leads to weird behavior for the end users.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/227>

test-source: Respect asset natural size

We had cases where the frame positioner had the default natural size for
video test sources instead of the user provided one.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/227>

ges-launcher: do not set rendering details too early

It looks like the _set_rendering_details call is superfluous
in _startup(), as it will get called in run_pipeline.

The problem with calling it before timeline_set_user_options
is that we are going to fail creating a smart profile if
the user selected eg --track-types=video, as the get_smart_profile
method compares the tracks in the asset with those on the timeline.

Reproduce with a video-only clip:

ges-launch-1.0 --track-types=video +clip file://$PWD/jelly.mp4 \
inpoint=15.0 -o foo.mp4 --smart-rendering

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/228>

ges-structure-parser: force string types

Force a string type for structure values obtained through parsing a
serialized timeline by inserting a (string) specifier after a '=',
rather than relying on gst_structure_from_string guessing the type.

As such, the functions that extract clocktimes and properties are
modified to accept string value types.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/123>

command-line-formatter: fix typos

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/123>

marker-list: made deserialize reverse of serialize

Changed deserialize method to actually reverse the serialize method by
removing the edge quote marks and reversing g_strescape.

See https://gitlab.freedesktop.org/gstreamer/gstreamer/issues/452

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/123>

uri-source: Respect stream-id even on streams muxed in raw

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 https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/issues/126

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/222>

audio-track: Respect track restrictions in our gaps

Avoiding not negotiated errors in specific cases.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/225>

launch: Ensure to add required ref to profiles from project

We were unreffing something we were not owning

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/224>

tests: fix meson test env setup to make sure we use the right gst-plugin-scanner

This is the same fix that was applied in gst-plugins-good in
https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/603
and fixes the testsuite running in gst-build.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/219>

launch: Add an interactive mode where we can seek etc...

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/209>

meson: Enable some MSVC warnings for parity with GCC/Clang

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 https://gitlab.freedesktop.org/gstreamer/gst-build/-/merge_requests/223

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/220>

init: Fix initialisation crash

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: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/217>

Meson: Use pkg-config generator

utils.c: fix static build

Static build fails since version 1.17.1 and
https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/commit/1e488d4311420b5ca193155ad8ab05509c9a4a37
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/2a528a1185644f5b23d26eb3f2b342e99aa1e493

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/216>

meson: actually check glib dependency version

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: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/212>

meson: update glib minimum version to 2.56

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: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/215>

ges: Do not recreate auto-transitions when changing clip assets

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: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/208>

ges: Fix a copy/paste mistake in meson file

Passed unnoticed because we built against GstValidate

Fixes https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/issues/119

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/211>

video-transition: Make smpte props children properties

And deprecate old style accessors.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/207>

ci: include template from gst-ci master branch again

Back to development

Release 1.18.0

demux: Fixate documentation caps

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/210>

complex_effect_bin_desc: Regenerate expectation for compositor change

Part of: https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/796

tests: Fix running tests fully uninstalled

Fixes https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/issues/118

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/206>

Release 1.17.90

ges:source: Handle missing elements in converters

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/204>

smart-mixer: Move the videoconvert to after the mixer

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: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/204>

transition: Enhance name of the elements

Making it simpler to debug

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/204>

source: Handle missing elements in converter

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/204>

video-source: Stop giving useless name to frame positioner

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/204>

transition: Better document the way alpha is computed for transitions

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/204>

smart-mixer: Use the new 'samples-selected' signal to handle queuing in aggregator pads

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: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/204>

ges:validate: Allow setting keyframes using the clips directly

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/204>

ges-source: Ensure that we output stream with segments in time

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/198>

pipeline: Restrict the presence only if the user didn't explicitly provided one

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/198>

timeline: Add a simplified version of track selection signal

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: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/198>

uri-source: Respect user stream selection

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/198>

launch: Also print the position when disabling validate

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/198>

launch: Print more useful information to stdout

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/198>

build: Add an option to disable examples

And make it yield as in other modules

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/198>

launcher: Re activate smart rendering support

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

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/198>

ges: Fix smart rendering

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: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/198>

validate: Pipe debug output to a file when discovering scenarios

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

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/198>

nle: Minor debug enhancement

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/198>

tests: Mark audio identity as audio

Otherwise GES fallbacks to video...

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/198>

pipeline: stop setting the track caps

Stop setting the track 'caps' property. The previous code could
overwrite a users own setting of the caps for video and audio caps.
Moreover, the 'caps' property is listed as construct only, and users
will likely expect it to stay the same after a track has been added to a
timeline.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/198>

launcher: Delay setting rendering setting to right before rendering

So that user settings have been applied to the timeline taking into
account any `validatetest` arguments

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/198>