[Bug 689182] New: [pitivi] Making a frei0r ElementFactory does a lot of I/O and slows down startup

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=689182
  GStreamer | gst-plugins-bad | 1.0.2

           Summary: [pitivi] Making a frei0r ElementFactory does a lot of
                    I/O and slows down startup
    Classification: Platform
           Product: GStreamer
           Version: 1.0.2
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: nekohayo at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=230035)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=230035)
test script

In pitivi, I need to check for the presence of at least one particular frei0r
plugin. The problem is that on a cold start, this takes 3 seconds on an average
computer (without an SSD), which multiplies the application startup time by 2
or 3 times.

Attached is a very simple script that demonstrates the problem. frei0r is
affected when creating an ElementFactory, but libav is not.

# sync && echo 3 > /proc/sys/vm/drop_caches

$ python bench_plugins_loading.py 
gst init took 0.411 secs
    making a sandwich: 0.431 secs
    making another sandwich: 0.000 secs
    frei0r (reg): 0.003 secs
    libav (reg): 0.000 secs
    frei0r (factory): 2.195 secs   <-----------
    libav (factory): 0.121 secs
Soft deps check done in 2.752 seconds

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