DirectShow RedenStream无法捕获 [英] directshow RedenStream Fails for Capture

问题描述

我正在制作一个Directshow应用程序来捕获MP4视频.我使用下面的图形来做到这一点.

I am making an Directshow Application to Capture MP4 video. I use below graph to do so.

Input Stream --> MJPEG Decompressor --> x264vfw H.264/MPEG-4 AVC Codec --> GDCL Mpeg-4 Multiplexor --> File Writer

在我的DirectShow应用程序中，我创建了所需的过滤器，并将它们连接到图形上，最后我执行了文件写入器操作，并使用pin作为捕获来使流变红.我的代码的一部分如下.

in my directshow application , i created the required filters and connect them on graph , at end i do file writer operation and redder stream using pin as capture. that part of my code is as below.

GUID guid;
guid = MEDIASUBTYPE_x264;

hr = gcap.pBuilder->SetOutputFileName(&guid, gcap.wszCaptureFile,
                                      &g_mp4mux, &gcap.pSink);



hr = gcap.pBuilder->RenderStream(&PIN_CATEGORY_CAPTURE,
                                     &MEDIATYPE_Interleaved,
                                     gcap.pVCap, pVcompFilter, NULL);
if(hr != NOERROR)
{
    hr = gcap.pBuilder->RenderStream(&PIN_CATEGORY_CAPTURE,
                                        &MEDIATYPE_Video,
                                        gcap.pVCap, pVcompFilter, NULL);
    if(hr != NOERROR)
    {
        ErrMsg(TEXT("Cannot render video capture stream"));
        TearDownGraph();
        return FALSE;
    }
}

上面的代码

g_mp4mux是GDCL MPEG-4 Muliplexrer文件管理器

PVcompFilter是x264vfw H.264/MPEG-4 AVC codec过滤器

当我运行以上代码时，我得到HR = E_INVALIDARG.

when i run above code i get HR = E_INVALIDARG .

不知道上面的代码有什么问题. 请帮助.谢谢.

no idea what is wrong in above code. Plz help. Thanks.

推荐答案

RenderStream在内部执行多个步骤，并且如果在序列期间发生任何错误，则该错误将不带任何细节地转发回去.因此，E_INVALIADRG就是您所拥有的，您不知道这是您的调用还是某些内部错误的论点.

RenderStream does a number of steps internally and should any error happen during the sequence, the error is forwarded back without details. Hence, E_INVALIADRG is all you have, you don't know if this is a wrong argument on your call or some internal.

对于初学者，请检查您的参数(您可能在第3个和第4个参数中传递了NULL)，然后如果没有帮助，请使用直接图形构建调用(例如IGraphBuilder :: Connect)替换RenderStream，以了解更多有关错误.

For starters, check your arguments (you might be passing NULLs in 3rd and 4th parameters), then if it is not helpful replace RenderStream with direct graph building calls such as IGraphBuilder::Connect to possibly learn more about the error.

还要提及您的交叉发布:

Also mention your cross-posting: at msdn.microsoft.com

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