[Bug 793383] New: Crashing on iOS: [ALAssetRepresentation release]: message sent to deallocated instance, [GstAssetsLibrary .cxx_destruct] XCode 9.2, iOS 11.2 (15C107)

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793383

            Bug ID: 793383
           Summary: Crashing on iOS: [ALAssetRepresentation release]:
                    message sent to deallocated instance,
                    [GstAssetsLibrary .cxx_destruct] XCode 9.2, iOS 11.2
                    (15C107)
    Classification: Platform
           Product: GStreamer
           Version: 1.12.3
                OS: Mac OS
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: lephihungch at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

I'm stuck on crashing issue: message sent to deallocated instance zombie object
with GStreamer tutorial project for iOS with this version of XCode, the app
crashes when trying to unref the player or pipeline after playing a AVI file
saved in Camera Roll using ALAsset with prefix: 
assets-library://asset/asset.AVI?id=ID_OF_AVI_FILE&ext=AVI.

Crash point: typefind:sink -> [GstAssetsLibrary .cxx_destruct]

Crash callStackSymbols

<_NSCallStackArray 0x604000452180>(
0   ???                                 0x00000001226dbf1c 0x0 + 4872584988,
1   Tutorial 5                          0x0000000103211300 main + 0,
2   libobjc.A.dylib                     0x000000010bbb6912
_ZL27object_cxxDestructFromClassP11objc_objectP10objc_class + 127,
3   libobjc.A.dylib                     0x000000010bbc21a4
objc_destructInstance + 124,
4   libobjc.A.dylib                     0x000000010bbc21db object_dispose + 22,
5   AssetsLibrary                       0x00000001088a6acd -[ALAssetsLibrary
dealloc] + 98,
6   libobjc.A.dylib                     0x000000010bbcca2e
_ZN11objc_object17sidetable_releaseEb + 202,
7   libobjc.A.dylib                     0x000000010bbcd178
_ZN12_GLOBAL__N_119AutoreleasePoolPage3popEPv + 860,
8   libobjc.A.dylib                     0x000000010bbce31b
_ZN12_GLOBAL__N_119AutoreleasePoolPage11tls_deallocEPv + 127,
9   libsystem_pthread.dylib             0x000000010ca0f27e _pthread_tsd_cleanup
+ 534,
10  libsystem_pthread.dylib             0x000000010ca0efbd _pthread_exit + 79,
11  libsystem_pthread.dylib             0x000000010ca0d6cc pthread_sigmask + 0,
12  libsystem_pthread.dylib             0x000000010ca0d56d _pthread_body + 0,
13  libsystem_pthread.dylib             0x000000010ca0cc5d thread_start + 13
)

>https://github.com/sdroege/gst-player
>https://github.com/GStreamer/gst-docs/tree/master/examples/tutorials/xcode%20iOS

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