In general, brought the behaviour of the `start`, `duration` and
`inpoint` setters in line with each other. In particular:
1. fixed return value the GESSourceClip `duration` setter
2. changed the GESClip `start` setter
3. fixed the inpoint callback for GESContainer
4. changed the type of `res` in GESTimelineElement to be gint to
emphasise that the GES library is using the hack that a return of -1
from klass->set_duration means no notify signal should be sent out.
Also added a new test for clips to ensure that the setters work for
clips within and outside of timelines, and that the `start`, `inpoint`
and `duration` of a clip will match its children.
Aiming at fixing a rare race condition where we get:
../subprojects/gstreamer/libs/gst/check/gstcheck.c:1258:F:nlecomposition:test_seek_on_nested:0: nested_src0_0x1a1a310 is not destroyed, 1 refcounts left!
The idea is that there might have a remaining GstMessage
with the nested_src as `message.src` on the bus that has
yet to be processed in some conditions leading to a reference
still existing when unrefing the pipeline.
Subprojects simply consist of adding the GESProject
to the main project asset list. Then those are recursively
serialized in the main project in the <asset> not, when deserializing,
temporary files are created and those will be used in clips
as necessary
Otherwise if we shutdown a composition whith an nested composition
(inside a source in the test) and leak it, we end up with the nested
composition task still running (in READY) which is bad.
Add a test for that which leaks the pipeline on purpose.
This is implemented on top of a Tree that represents the whole timeline.
SourceClips can not fully overlap anymore and the tests have been
updated to take that into account. Some new tests were added to verify
that behaviour in greater details
Each timeline element is in a layer (potentially spanning
over several), it is very often useful to retrieve an element
layer priority (from an app perspective more than the element
priority itself as that is a bit of an implementation detail
in the end).
Port tests to it
Auto transition when having 3 overlapping clips in a same point in the
timeline is not supported as we can't handle it in a nice way. Before we
to avoid creating 2 overlapping transitions (which is plain broken in
NLE) were completely disabling `auto-transition` and removing all
auto-transitions in the timeline but this is pretty weird for the end
user. This commit changes and now makes sure 2 transitions are not
created in the same place.
Also cleanup previous test case.
And start handling relocated assets.
Also expose the discoverer callback as a vmethod so that we can
overridde the discoverer when necessary (to handle discovering of
timeline through gesdemux for example)
