使用 IMFSourceReader 打开视频文件 [英] Using IMFSourceReader to open a video file

问题描述

我想使用 IMFSourceReader 打开一个视频文件以访问其作为 IMFSample 的帧.在 WinRT C++ 类中，我发送视频文件的 RandomAccessStream 并使用以下代码创建一个 IMFSourceReader 对象.

I want to open a video file using IMFSourceReader to access its Frames as IMFSample. In a WinRT C++ Class I send the RandomAccessStream of a video file and use the following code to create an IMFSourceReader object.

HRESULT hr = S_OK;

ComPtr<IMFSourceReader> pSourceReader;
ComPtr<IMFByteStream> spByteStream;

if (SUCCEEDED(hr))
{
    // Initialize the Media Foundation platform.
    hr = MFStartup(MF_VERSION);


    hr = MFCreateMFByteStreamOnStreamEx((IUnknown*)InputVideoStream, &spByteStream);

    ComPtr<IMFAttributes> Atrr;
    hr = MFCreateAttributes(&Atrr, 10);
    hr = Atrr->SetUINT32(MF_READWRITE_ENABLE_HARDWARE_TRANSFORMS, true);

    hr = MFCreateSourceReaderFromByteStream(spByteStream.Get(), Atrr.Get(), &pSourceReader);
 }

但是函数 MFCreateSourceReaderFromByteStream() 的 HRESULT 正在返回 不支持给定 URL 的字节流类型.

But the HRESULT of the function MFCreateSourceReaderFromByteStream() is returning The Byte Stream Type of the Given URL is unsupported.

我不知道我做错了什么.谁能告诉我正确的方法?我使用的是 Windows 8.1.

I don't know what i'm doing wrong. Can anyone show me the correct way? I'm using Windows 8.1.

推荐答案

我找到了解决IMFSourceReaderThe Byte Stream Type of the Given URL is unsupported问题的解决方案>.我可以读取 WMV 文件的字节流，一些 MP4 文件，但不是所有类型的视频文件.所以在使用 MFCreateSourceReaderFromByteStream() 之前，我将视频流转换为 VC-1/WMV 格式，MFCreateSourceReaderFromByteStream() 可以读取该格式.我使用 MSDN 的 媒体转码示例 将视频转换为WMV 视频.现在我可以毫无错误地使用 MFCreateSourceReaderFromByteStream().

I have found a solution to the The Byte Stream Type of the Given URL is unsupported problem of IMFSourceReader. I could read Byte Stream of WMV files, some MP4 files but not all kind of video files. So before using MFCreateSourceReaderFromByteStream() I converted the video stream to VC-1/WMV format which the MFCreateSourceReaderFromByteStream() is able to read. I used the Transcoding media sample of MSDN to convert he video into WMV video. Now I am able to use MFCreateSourceReaderFromByteStream() without any error.

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