Memory leak only on Windows

[Nikos Chantziaras]

Hello.

Is anyone aware of any memory leaks with video on Windows? I had a 
memory leak previously, but that was my own fault (I was doing a 
gst_buffer_map() and forgot to gst_buffer_unmap() afterwards.)

On Linux, there is no leak. On Windows however, memory usage piles up 
and up and up as videos play. This happens even with the simplest "hello 
world" way of playing a video; creating a playbin, load a video from a 
file and play it.

The only "non-standard" things are the use of a statically built 
gstreamer (with static plugins-base, plugins-good, plugins-bad [for 
d3dvideosink] and gst-libav [for video decoding]) cross-compiled from 
Linux to Windows with a MinGW-w64 cross-compiler (32-bit builds).

The only plugins needed are registered before use:

   GST_PLUGIN_STATIC_REGISTER(app);
   GST_PLUGIN_STATIC_REGISTER(avi);
   GST_PLUGIN_STATIC_REGISTER(coreelements);
   GST_PLUGIN_STATIC_REGISTER(d3dsinkwrapper);
   GST_PLUGIN_STATIC_REGISTER(libav);
   GST_PLUGIN_STATIC_REGISTER(opengl);
   GST_PLUGIN_STATIC_REGISTER(playback);
   GST_PLUGIN_STATIC_REGISTER(typefindfunctions);

The majority of the work is done by the libav plugin, so no more plugins 
are needed.

Also, since I'm using Qt, I'm launching a GMainLoop in a GThread for 
gstreamer to dispatch its events/messages, since on Windows Qt does not 
utilize glib. However, doing the same on Linux with a Qt built without 
glib support, does not result in any leaks, so it doesn't look like this 
has anything to do with it.

I'm using latest official tarballs for everything (1.4.5).