[Bug 722311] New: matroskaparse should try to identify data on stream header before going with a blind

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=722311
  GStreamer | gst-plugins-good | git

           Summary: matroskaparse should try to identify data on stream
                    header before going with a blind
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: reynaldo at opendot.cl
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


While working on another issue, realized filesrc ! matroskaparse ! shout2send
doesn't work for a webm file whereas filesrc ! oggparse ! shout2send does for
ogg/vorbis. Reason for the failure is the quick fallback to
video/x-matroska on the parser while a typefind over the stream header
can easily (albeit costly?) find out the data being pushed by filesrc
is actually video/webm without blindly claiming otherwise.

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