[Bug 734219] New: textoverlay support forced updating text when new text buffer come

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=734219
  GStreamer | gst-plugins-base | git

           Summary: textoverlay support forced updating text when new text
                    buffer come
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: cjun.wang at samsung.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


some text producer element, such as closed caption decoder "cea708dec", output
text buffer whose duration is not fixed. That means when text buffer display,
it's not determined yet when text will be destroyed.
https://bugzilla.gnome.org/show_bug.cgi?id=704881

To support this kind of instant buffer, added a property "force-update-text",
to allow update text when new text buffer come and existed buffer duration is
not finished. It is extremely useful to show scrollable closed caption text.
This property's default value is false. so it would not influence current
logics.

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