[Bug 788869] New: Play variant streams of m3u8 file about HLS, can not switch subtitles

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=788869

            Bug ID: 788869
           Summary: Play variant streams of m3u8 file about HLS, can not
                    switch subtitles
    Classification: Platform
           Product: GStreamer
           Version: 1.12.3
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: 490202531 at qq.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 361410
  --> https://bugzilla.gnome.org/attachment.cgi?id=361410&action=edit
my program

My m3u8 file contains about eight subtitles,and one video,two audios.
the program based on Playback tutorial 2: Subtitle management
subtitles can be displayed,but when i switch subtitle to another, there is no
subtitle display in the window anymore.
and the variant stream can be selected automatic.

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