c++ - MediaFoundation HEVC H265 编码

Question

我能够使用 MediaFoundation 成功编码 H264 视频。

现在我想导出 HEVC，根据 official documentation , 受支持。

我正在按照那里的描述做所有事情，但是每当我想为编写器设置输入媒体类型时，它都会以错误告终:

没有找到合适的转换来编码或解码内容。

这是我所做的简短代码:

/* 设置输出媒体类型 */

IMFMediaType* pMediaTypeOut = nullptr;
MFCreateMediaType(&pMediaTypeOut);
pMediaTypeOut->SetGUID(MF_MT_MAJOR_TYPE, MFMediaType_Video);
pMediaTypeOut->SetGUID(MF_MT_SUBTYPE, MFVideoFormat_HEVC);
MFSetAttributeSize(pMediaTypeOut, MF_MT_FRAME_SIZE, 640, 480);
MFSetAttributeRatio(pMediaTypeOut, MF_MT_FRAME_RATE, 30, 1);
pMediaTypeOut->SetUINT32(MF_MT_MPEG2_PROFILE, eAVEncH265VProfile_Main_420_8);
pMediaTypeOut->SetUINT32(MF_MT_MPEG2_LEVEL, eAVEncH265VLevel1);

// Add it to the sink writer
m_pWriter->AddStream(pMediaTypeOut, &m_streamIndex);

/* 设置输入媒体类型 */

IMFMediaType* pMediaTypeIn = nullptr;
MFCreateMediaType(&pMediaTypeIn);
pMediaTypeIn->SetGUID(MF_MT_MAJOR_TYPE, MFMediaType_Video);
pMediaTypeIn->SetGUID(MF_MT_SUBTYPE, MFVideoFormat_NV12);
MFSetAttributeSize(pMediaTypeIn, MF_MT_FRAME_SIZE, 640, 480);
MFSetAttributeRatio(pMediaTypeIn, MF_MT_FRAME_RATE, 30, 1),
MFSetAttributeRatio(pMediaTypeIn, MF_MT_PIXEL_ASPECT_RATIO, 1, 1),

// Here it ends up with an error
m_pWriter->SetInputMediaType(m_streamIndex, pMediaTypeIn, nullptr);

有谁知道是否真的支持 HEVC 编码，或者它只是一个文档。如果微软真的支持它，那我做错了什么？

顺便说一句:我使用的是最新版本的 Windows 10。为简化代码省略了错误检查

Answer 1

您的输出媒体类型不完整:

MF_MT_AVG_BITRATE Average encoded bit rate, in bits per second. Must be greater than zero.

MF_MT_INTERLACE_MODE 的类似问题。

有效的代码片段:

Check(MFStartup(MF_VERSION));

ComPtr<IMFSinkWriter> SinkWriter;
Check(MFCreateSinkWriterFromURL(L"D:\\temp.mp4", nullptr, nullptr, SinkWriter.GetAddressOf()));

ComPtr<IMFMediaType> OutputMediaType;
Check(MFCreateMediaType(OutputMediaType.GetAddressOf()));
Check(OutputMediaType->SetGUID(MF_MT_MAJOR_TYPE, MFMediaType_Video));
Check(OutputMediaType->SetGUID(MF_MT_SUBTYPE, MFVideoFormat_HEVC));
Check(MFSetAttributeSize(OutputMediaType.Get(), MF_MT_FRAME_SIZE, 640, 480));
Check(OutputMediaType->SetUINT32(MF_MT_INTERLACE_MODE, MFVideoInterlace_Progressive));
Check(MFSetAttributeRatio(OutputMediaType.Get(), MF_MT_FRAME_RATE, 30, 1));
//Check(OutputMediaType->SetUINT32(MF_MT_MPEG2_PROFILE, eAVEncH265VProfile_Main_420_8));
//Check(OutputMediaType->SetUINT32(MF_MT_MPEG2_LEVEL, eAVEncH265VLevel1));
Check(OutputMediaType->SetUINT32(MF_MT_AVG_BITRATE, 1000000));

DWORD StreamIndex;
Check(SinkWriter->AddStream(OutputMediaType.Get(), &StreamIndex));

ComPtr<IMFMediaType> InputMediaType;
Check(MFCreateMediaType(InputMediaType.GetAddressOf()));
Check(InputMediaType->SetGUID(MF_MT_MAJOR_TYPE, MFMediaType_Video));
Check(InputMediaType->SetGUID(MF_MT_SUBTYPE, MFVideoFormat_NV12));
Check(MFSetAttributeSize(InputMediaType.Get(), MF_MT_FRAME_SIZE, 640, 480));
Check(InputMediaType->SetUINT32(MF_MT_INTERLACE_MODE, MFVideoInterlace_Progressive));
Check(MFSetAttributeRatio(InputMediaType.Get(), MF_MT_FRAME_RATE, 30, 1)),
//Check(MFSetAttributeRatio(InputMediaType.Get(), MF_MT_PIXEL_ASPECT_RATIO, 1, 1)),

Check(SinkWriter->SetInputMediaType(StreamIndex, InputMediaType.Get(), nullptr));