[Bug 676388] New: [pitivi] Support the notion of placeholder/empty clips and allow manually swapping clips

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=676388
  GStreamer | gst-editing-services | git

           Summary: [pitivi] Support the notion of placeholder/empty clips
                    and allow manually swapping clips
    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: nekohayo at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Let's say we have a project with clips A, B, C, that are all in the source list
(pitivi's media library) and in the timeline.

For some reason, clip B is temporarily unavailable on the hard drive or the
user has deleted it.

AFAICT, currently there is no mechanism to handle this; either the project
loads fully with all related media, or it fails completely.

Ideally, we should allow loading a project and, if the user cannot immediately
provide a replacement for the missing clip "B", tell the application that this
clip B is to be considered a placeholder. Then, the application could show it
as such in its media library and in the timeline.

Later on, the user could either delete the placeholder or provide a replacement
for it (ex: right click, -> "Replace clip...").

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