[Bug 708588] New: Automatic transitions signal the wrong position values to the UI/clients when creating them quickly?

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=708588
  GStreamer | gst-editing-services | git

           Summary: Automatic transitions signal the wrong position values
                    to the UI/clients when creating them quickly?
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-editing-services
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: nekohayo at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=255534)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=255534)
screencast

With Pitivi and GES, if you crossfade quickly, the transition on the timeline
canvas will not be sized and positioned correctly. This only affects the UI
representation, not the playback/render pipeline, as seeking through the
transition reveals the transition was correctly positioned but doesn't match
the visual representation.

The attached screencast demonstrates the problem.

Mathieu is confident that this not a UI bug, that the timleine UI does
"strictly what it's told"; if you tell it "this transition is 10 feet long", it
will believe you. Maybe something in the backend is forgetting to
signal/signalling at the wrong time/values.

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