$ valgrind ./a.out
==31875== Memcheck, a memory error detector
==31875== Copyright (C) 2002-2011, and GNU GPL'd, by Julian Seward et al.
==31875== Using Valgrind-3.7.0 and LibVEX; rerun with -h for copyright info
==31875== Command: ./a.out
==31875== 
==31875== Invalid write of size 8
==31875==    at 0x4F7FEC6: Gst::PlayBin2_Class::class_init_function(void*, void*) (in /usr/lib/libgstreamermm-0.10.so.2.0.1)
==31875==    by 0x6A33626: g_type_class_ref (in /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0.3200.3)
==31875==    by 0x5839286: Glib::ConstructParams::ConstructParams(Glib::Class const&, char const*, ...) (in /usr/lib/x86_64-linux-gnu/libglibmm-2.4.so.1.3.0)
==31875==    by 0x4F80D79: Gst::PlayBin2::PlayBin2() (in /usr/lib/libgstreamermm-0.10.so.2.0.1)
==31875==    by 0x4F81395: Gst::PlayBin2::create() (in /usr/lib/libgstreamermm-0.10.so.2.0.1)
==31875==    by 0x40067C: main (main.cpp:6)
==31875==  Address 0xaab0b38 is 0 bytes after a block of size 712 alloc'd
==31875==    at 0x4C29DB4: calloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==31875==    by 0x6FFCAE0: g_malloc0 (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.3)
==31875==    by 0x6A33575: g_type_class_ref (in /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0.3200.3)
==31875==    by 0x5839286: Glib::ConstructParams::ConstructParams(Glib::Class const&, char const*, ...) (in /usr/lib/x86_64-linux-gnu/libglibmm-2.4.so.1.3.0)
==31875==    by 0x4F80D79: Gst::PlayBin2::PlayBin2() (in /usr/lib/libgstreamermm-0.10.so.2.0.1)
==31875==    by 0x4F81395: Gst::PlayBin2::create() (in /usr/lib/libgstreamermm-0.10.so.2.0.1)
==31875==    by 0x40067C: main (main.cpp:6)
==31875== 
==31875== 
==31875== HEAP SUMMARY:
==31875==     in use at exit: 4,570,794 bytes in 13,626 blocks
==31875==   total heap usage: 45,026 allocs, 31,400 frees, 49,283,724 bytes allocated
==31875== 
==31875== LEAK SUMMARY:
==31875==    definitely lost: 16,444 bytes in 2 blocks
==31875==    indirectly lost: 240 bytes in 10 blocks
==31875==      possibly lost: 481,657 bytes in 2,302 blocks
==31875==    still reachable: 4,072,453 bytes in 11,312 blocks
==31875==         suppressed: 0 bytes in 0 blocks
==31875== Rerun with --leak-check=full to see details of leaked memory
==31875== 
==31875== For counts of detected and suppressed errors, rerun with: -v
==31875== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 2 from 2)