#0  0x00007f004bf2fbc2 in free () from /tmp/apport_sandbox_0jNQPD/lib/x86_64-linux-gnu/libc.so.6
#1  0x00007f001a4aba2d in gst_discoverer_subtitle_info_finalize () from /tmp/apport_sandbox_0jNQPD/usr/lib/x86_64-linux-gnu/libgstpbutils-1.0.so.0
#2  0x00007f004c7b7d9a in g_object_unref () from /tmp/apport_sandbox_0jNQPD/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#3  0x00007f001a4ac2a0 in gst_discoverer_stream_info_list_free () from /tmp/apport_sandbox_0jNQPD/usr/lib/x86_64-linux-gnu/libgstpbutils-1.0.so.0
#4  0x00007f001abbf8d4 in tracker_extract_gstreamer.isra () from /tmp/apport_sandbox_0jNQPD/usr/lib/x86_64-linux-gnu/tracker-1.0/extract-modules/libextract-gstreamer.so
#5  0x00007f001abc17d9 in tracker_extract_get_metadata () from /tmp/apport_sandbox_0jNQPD/usr/lib/x86_64-linux-gnu/tracker-1.0/extract-modules/libextract-gstreamer.so
#6  0x000000000040b27e in get_file_metadata ()
#7  0x000000000040b3a3 in get_metadata ()
#8  0x000000000040b610 in dispatch_task_cb ()
#9  0x00007f004c4dbfda in g_main_context_dispatch () from /tmp/apport_sandbox_0jNQPD/lib/x86_64-linux-gnu/libglib-2.0.so.0
#10 0x00007f004c4dc380 in g_main_context_iterate.isra () from /tmp/apport_sandbox_0jNQPD/lib/x86_64-linux-gnu/libglib-2.0.so.0
#11 0x00007f004c4dc6a2 in g_main_loop_run () from /tmp/apport_sandbox_0jNQPD/lib/x86_64-linux-gnu/libglib-2.0.so.0
#12 0x0000000000409c74 in main ()