[Bug 680366] New: GstDiscoverer slows down when discovering multiple files

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=680366
  GStreamer | don't know | 0.10.36

           Summary: GstDiscoverer slows down when discovering multiple
                    files
    Classification: Platform
           Product: GStreamer
           Version: 0.10.36
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: don't know
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: mail at jensge.org
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=219375)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=219375)
Simple testcase

Starting investigation from
https://mail.gnome.org/archives/rygel-list/2012-July/msg00129.html

It looks like that 0.10, the repeated use of a GstDiscoverer in a
mass-extraction scenario (such as Rygel's metadata harvester) causes the
discoverer to slow down quite a lot after some rounds of extraction.

See attached example which simulates the extraction of 4.5k mp3 files. After
~1.5k extractions the time for a single extraction is up to ~0.5s from ~0.005
seconds.

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