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    Random crash while capture matinee movie

    Hello,

    We are using 4.15.3.

    Just one person in our team suffers from (random but frequent) engine crash when he tries capturing rendered scene from matinee.
    I have a crash call stack and tried the same step many times but I was not able to reproduce it.
    Still the crashing spot involves render-thread command and a pointer that can be possibly stained,
    so hoping somebody might experienced the same or provide a hint...

    Repro step :
    Open a matinee > Click Movie icon at right most side
    From Render Movie Settings dialog..
    Set Out Format as Image Sequence (png) && Frame Rate 30 && Resolution 1920x1080
    Start Capture Movie

    I guess heavier matinee sequence might make higher crash probability.. just guessing.

    Here is a crash call stack
    ===========================
    Access violation - code c0000005 (first/second chance not available)

    UE4Editor_MovieSceneCapture!<lambda_96becad0a73807e71736e1298578a9dd>:perator()() [c:\b2build_common\depot\bii-dev\engine\source\runtime\moviescenecapture\private\framegrabber.cpp:93]
    UE4Editor_MovieSceneCapture!TGraphTask<`FViewportSurfaceReader::ResolveRenderTarget'::`2'::EURCMacro_ResolveCaptureFrameTexture>::ExecuteTask() [c:\b2build_common\depot\bii-dev\engine\source\runtime\core\public\async\taskgraphinterfaces.h:884]
    UE4Editor_Core!FNamedTaskThread::ProcessTasksNamedThread() [c:\b2build_common\depot\bii-dev\engine\source\runtime\core\private\async\taskgraph.cpp:954]
    UE4Editor_Core!FNamedTaskThread::ProcessTasksUntilQuit() [c:\b2build_common\depot\bii-dev\engine\source\runtime\core\private\async\taskgraph.cpp:701]
    UE4Editor_RenderCore!RenderingThreadMain() [c:\b2build_common\depot\bii-dev\engine\source\runtime\rendercore\private\renderingthread.cpp:325]
    UE4Editor_RenderCore!FRenderingThread::Run() [c:\b2build_common\depot\bii-dev\engine\source\runtime\rendercore\private\renderingthread.cpp:459]
    UE4Editor_Core!FRunnableThreadWin::Run() [c:\b2build_common\depot\bii-dev\engine\source\runtime\core\private\windows\windowsrunnablethread.cpp:76]
    ============================

    Thank!
    Attached Files
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