[Bug 737744] New: ges formatter: Load and save children properties from track elements

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=737744
  GStreamer | gst-editing-services | git

           Summary: ges formatter: Load and save children properties from
                    track elements
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gst-editing-services
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: lubosz at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=287539)
 View: https://bugzilla.gnome.org/attachment.cgi?id=287539
 Review: https://bugzilla.gnome.org/review?bug=737744&attachment=287539

This patch enables the formatter to load and store children properties on track
elements.

The ges-base-xml-formatter.c is currently unable to load and store
children-properties from track elements.

This is needed to store and load position and size from clips, like in this
xges example:
http://wiki.pitivi.org/wiki/XGES_Examples#Clip_Position_and_Size

A track element is described with a <source> XML tag. The example does not work
without these patches, and Pitivi is not able to store values on track
elements. There is no other way to manipulate the dimension of the clip in ges.

This is a series of patches written by Joris Valette.

He published them in following Github ticktes:
https://github.com/pitivi/gst-editing-services/issues/54
https://github.com/pitivi/gst-editing-services/issues/56

Since these patches never made it through code review, I am willing to improve
them so they can get merged.

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