Chrome本机客户端，必须使用media_track_video主线程吗？

Question

我更改了演示代码media_stream_video.cc 通过以下代码将ConfigureTrack设置为单线程：

m_p_worker_thread.message_loop().PostWork(callback_factory_.NewCallback(&MediaStreamVideoDemoInstance::ConfigureTrack));

然后从JavaScript中，通过以下代码将视频样本更改为共享样本：

chrome.desktopCapture.chooseDesktopMedia(["screen", "window"], onAccessApproved);

function onAccessApproved(){
    navigator.webkitGetUserMedia({
        audio: false,
        video: {
            mandatory: {
                chromeMediaSource: 'desktop',
                chromeMediaSourceId: desktop_id,
                maxWidth: 1920,
                maxHeight: 1200,
                maxFrameRate: 5
            }
        }
    }, success, console.log); 
}

我重复停止共享并开始共享。将崩溃，下面是回溯：

#0  0x000000000fe509c2 in ?? ()
#1  0x000000000fd55f20 in ?? ()
#2  0x0000000000056d40 in pp::VideoFrame::GetFormat (this=0xfed7fa68) at video_frame.cc:49
#3  0x0000000000026240 in (anonymous namespace)::MediaStreamVideoDemoInstance::OnGetFrame (this=0xfeec0520, result=0,
    frame=...) at media_stream_video.cc:621
#4  0x0000000000026b20 in pp::CompletionCallbackFactory<(anonymous namespace)::MediaStreamVideoDemoInstance, pp::ThreadSafeThreadTraits>::DispatcherWithOutput0<pp::VideoFrame, void ((anonymous namespace)::MediaStreamVideoDemoInstance::*)(int, pp::VideoFrame)>::operator() (this=0xfeec1298, object=0xfeec0520, result=0)
    at D:/Project/nacl_sdk/pepper_49/include\ppapi/utility/completion_callback_factory.h:633
#5  0x0000000000026920 in pp::CompletionCallbackFactory<(anonymous namespace)::MediaStreamVideoDemoInstance, pp::ThreadSafeThreadTraits>::CallbackData<pp::CompletionCallbackFactory<(anonymous namespace)::MediaStreamVideoDemoInstance, pp::ThreadSafeThreadTraits>::DispatcherWithOutput0<pp::VideoFrame, void ((anonymous namespace)::MediaStreamVideoDemoInstance::*)(int, pp::VideoFrame)> >::Thunk (user_data=0xfeec12a8, result=0)
    at D:/Project/nacl_sdk/pepper_49/include\ppapi/utility/completion_callback_factory.h:584
#6  0x000000000fea6840 in ?? ()
#7  0x000000000fe0d420 in ?? ()
#8  0x000000000fe0d5a0 in ?? ()
#9  0x000000000fe0d4e0 in ?? ()
#10 0x000000000fdd8100 in ?? ()
#11 0x000000000fdb7560 in ?? ()
#12 0x000000000fdb79e0 in ?? ()
#13 0x000000000fdb7ca0 in ?? ()
#14 0x000000000fdb9ca0 in ?? ()
#15 0x000000000fdcb880 in ?? ()
#16 0x000000000fea2120 in ?? ()
#17 0x000000000fe153e0 in ?? ()
#18 0x000000000fe162c0 in ?? ()
#19 0x0000000000041980 in pp::MessageLoop::Run (this=0xfeec06f0) at message_loop.cc:67
#20 0x0000000000050740 in pp::(anonymous namespace)::RunThread (void_data=0xfeec06f0) at simple_thread.cc:41
---Type <return> to continue, or q <return> to quit---
#21 0x0000000000062d80 in nc_thread_starter () at src/untrusted/pthread/nc_thread.c:101
#22 0x000000000fdf9560 in ?? ()
#23 0x0000000000000000 in ?? ()

测试手册：联想 CPU：Inter（R）Celeron（R）CPU N3350 @ 1.10GHz 架构：x86_64 处理器数量：2

我测试另一本书，没有这个问题。 我认为这是一个竞争问题。但我不确定。 有人可以帮助我吗？