GES 1.12, Two bugs (possibly related) with (1) GESEffect volume and (2) layer ordering priority

[David Ing]

My timeline consists of 3 layers, where each layer has a GESUriClip.

For each of the 3 clips, ...

I created a GESEffect using either

GESEffect* gesEffect = ges_effect_new("volume volume=1.0")

GESEffect* gesEffect = ges_effect_new("volume mute=true")

Then I added the effect to the clip

ges_container_add(reinterpret_cast<GESContainer*>(gesUriClip),
reinterpret_cast<GESTimelineElement*>(gesEffect))

Is this generally the correct way to add effects to clips?  (Sometimes I
feel like I'm groping around a dark hallway.)

On Thu, Jul 19, 2018 at 3:53 PM, Thibault Saunier <tsaunier at gnome.org>
wrote:

> > Thibault, your suggestion for #1 worked like a charm.  It fixed both of
> the problems.
> >
> > I have two followup questions.
> >
> > This experience has me a little worried.  If GESEffect does not work
> well for the `volume` plugin, can I expect problems with most of the other
> plugins?
>
> Well, we use it very extensively in Pitivi without (known) problem,
> how did you use them exactly?
>
> > For future reference, I don't know how to save a *.xges file.  Would I
> use `ges_timeline_save_to_uri` for that?
>
> Yes.
>
> > On Thu, Jul 19, 2018 at 2:35 PM, Thibault Saunier <
> saunierthibault at gmail.com> wrote:
> >>
> >> Hello,
> >>
> >> 1. Setting mute=true means that the source will send silent, which is
> >> not what you want. Also you do not need an effect to handle the volume
> >> as there is already a volume element inside sources you can use the
> >> ges_timeline_element_set_child_property(element, "volume"....)[0]
> >> method to set it. You can see what properties audio sources expose
> >> here: https://gstreamer.freedesktop.org/data/doc/gstreamer/head/
> gstreamer-editing-services/html/GESAudioSource.html
> >>
> >> 2. Layer with lower priorities are on top of the stack of layers,
> >> meaning that layer with prio=0 is "the first". Now I am not sure why
> >> you get that error but it seems to be a NLEObject priority issue.
> >> Providing a .xges file would help (just save your timeline and paste
> >> it here if removing the effect doesn't work).
> >>
> >> Regards,
> >>
> >> Thibault Saunier
> >>
> >> [0] https://gstreamer.freedesktop.org/data/doc/gstreamer/head/
> gstreamer-editing-services/html/GESTimelineElement.html#
> ges-timeline-element-set-child-property
> >> _______________________________________________
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> >
> >
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