[Bug 777206] New: mosaic issue for MPEG DASH live streaming

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=777206

            Bug ID: 777206
           Summary: mosaic issue for MPEG DASH live streaming
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: r97922153 at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 343415
  --> https://bugzilla.gnome.org/attachment.cgi?id=343415&action=edit
issue description in detail

as https://bugzilla.gnome.org/show_bug.cgi?id=767682

original test URL is invalid but I found a one which can reproduce the issue.

Please refer to the attached in detail, or by the link below:
http://programmingmemojohnchang.blogspot.tw/2017/01/potential-race-condition-issue-of.html

I tested it for 1.4.5 (a little old) but I wonder it will happen for master
also.
Please help to check it.

[Test URL & settings]:
http://media-dcp.otvs.tv/storage/tears-of-steel/dash/live.main.isml/.mpd

[Issue]: 
Wrong codec settings leads to mosaic (ex, use the codec setting of high
bit-rate representation to decode data of low bit-rate representation ).

[Root cause]: 
1. Race condition between threads.
2. Slow start of gst_mpd_client_setup_streaming() when updating manifest.

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