[Bug 778337] New: qtdemux: sample_description_index not evaluated when parsing the stsd-box

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=778337

            Bug ID: 778337
           Summary: qtdemux: sample_description_index not evaluated when
                    parsing the stsd-box
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: juergen.sachs at metz-ce.de
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

In function qtdemux_parse_trak() when the 'stsd' child is evaluated the current
sample_description_index is not evaluated. There is alway the first entry used. 
The sample_description_index must be read from 'trex'-node (moov) and sometimes
is overwritten by following 'tfhd' (moof) box.
As of this failure the German DVB-T2 DASH streams (common init format) can not
be decoded (wrong capabilies) when lower bitrates are used
To reproduce use for example gst-play-1.0 with the stream:
gst-play-1.0
http://akamai-progressive.irt.de/irt_avstandard_2014/M4S/1280x720p50/V-1280x720p50_libx264_high_yuv420p_gop100_bit3584k_term5-2-5-14-1/seg2_frag2_hbbtv15_live_multi/V-1280x720p50_libx264_high_yuv420p_gop100_bit3584k_term5-2-5-14-1.mpd

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