2017-04-06 87 views
3

我试图在Windows Phone 8.1中使用Media Foundation库和接收器编码器对视频进行编码。Windows Phone 8.1媒体基金会H264最高分辨率

我已经能够通过我的媒体输出设置MFVideoFormat_H264MF_MT_SUBTYPE和使用像720p和480p的分辨率达到这个..

但是,当我更改分辨率1920×1080(1920×1088或)我得到一个错误Incorrect Parameter 。所以我想我的H.264编解码器的最大分辨率是1280x720。

我试着将编解码器更改为HVEC或MPEG2等......但没有运气。

这是CPP代码,我设置输出类型和它添加到流:

// Setup the output video type 

ComPtr<IMFMediaType> spvideoTypeOut; 
CHK(MFCreateMediaType(&spvideoTypeOut)); 
CHK(spvideoTypeOut->SetGUID(MF_MT_MAJOR_TYPE, MFMediaType_Video)); 

GUID _vformat = MFVideoFormat_H264; 

CHK(spvideoTypeOut->SetGUID(MF_MT_SUBTYPE, _vformat)); 
CHK(spvideoTypeOut->SetUINT32(MF_MT_AVG_BITRATE, _bitrate)); 
CHK(spvideoTypeOut->SetUINT32(MF_MT_INTERLACE_MODE, MFVideoInterlace_Progressive)); 
CHK(MFSetAttributeSize(spvideoTypeOut.Get(), MF_MT_FRAME_SIZE, _width, _height)); 
CHK(MFSetAttributeRatio(spvideoTypeOut.Get(), MF_MT_FRAME_RATE, framerate, 1)); 
CHK(MFSetAttributeRatio(spvideoTypeOut.Get(), MF_MT_PIXEL_ASPECT_RATIO, ASPECT_NUM, ASPECT_DENOM)); 

CHK(_spSinkWriter->AddStream(spvideoTypeOut.Get(), &_streamIndex)); 

而这正是我设置输入类型:

// Setup the input video type 

    ComPtr<IMFMediaType> spvideoTypeIn; 
    CHK(MFCreateMediaType(&spvideoTypeIn)); 
    CHK(spvideoTypeIn->SetGUID(MF_MT_MAJOR_TYPE, MFMediaType_Video)); 
    CHK(spvideoTypeIn->SetGUID(MF_MT_SUBTYPE, MFVideoFormat_RGB32)); 
    CHK(spvideoTypeIn->SetUINT32(MF_MT_INTERLACE_MODE, MFVideoInterlace_Progressive)); 
    CHK(MFSetAttributeSize(spvideoTypeIn.Get(), MF_MT_FRAME_SIZE, _width, _height)); 
    CHK(MFSetAttributeRatio(spvideoTypeIn.Get(), MF_MT_FRAME_RATE, framerate, 1)); 
    CHK(MFSetAttributeRatio(spvideoTypeIn.Get(), MF_MT_PIXEL_ASPECT_RATIO, ASPECT_NUM, ASPECT_DENOM)); 

    CHK(_spSinkWriter->SetInputMediaType(_streamIndex, spvideoTypeIn.Get(), nullptr)); 

    CHK(_spSinkWriter->BeginWriting()); 

要添加样本下沉作家我使用这个功能,而这正是发生异常:

void PictureWriter::AddFrame(const Platform::Array<uint8>^ videoFrameBuffer, int imageWidth, int imageHeight) 
{ 
    // Create a media sample 
    ComPtr<IMFSample> spSample; 
    CHK(MFCreateSample(&spSample)); 
    CHK(spSample->SetSampleDuration(_duration)); 
    CHK(spSample->SetSampleTime(_hnsSampleTime)); 

    _hnsSampleTime += _duration; 

    // Add a media buffer 
    ComPtr<IMFMediaBuffer> spBuffer; 
    CHK(MFCreateMemoryBuffer(_bufferLength, &spBuffer)); 
    CHK(spBuffer->SetCurrentLength(_bufferLength)); 
    CHK(spSample->AddBuffer(spBuffer.Get())); 

    // Copy the picture into the buffer 
    unsigned char *pbBuffer = nullptr; 
    CHK(spBuffer->Lock(&pbBuffer, nullptr, nullptr)); 
    BYTE* buffer = (BYTE*)videoFrameBuffer->begin() + 4 * imageWidth * (imageHeight - 1); 
    CHK(MFCopyImage(pbBuffer + 4 * _width * (_height - imageHeight), 
     4 * _width, buffer, -4 * imageWidth, 4 * imageWidth, imageHeight)); 

CHK(spBuffer->Unlock()); 

    // Write the media sample 
    CHK(_spSinkWriter->WriteSample(_streamIndex, spSample.Get())); 
} 

为什么你认为我得到了异常,我该如何解决这个问题?

谢谢。

+1

如何在接收器编写器的AddStream中设置媒体类型?你有没有尝试在其中指定高配置文件? – VuVirt

+1

我添加了所有与此问题相关的代码。不,我不知道该怎么做。 –

+1

您可以尝试添加:spvideoTypeOut-> SetUINT32(MF_MT_MPEG2_PROFILE,eAVEncH264VProfile_High); – VuVirt

回答

2

通过搜索用于每个分辨率默认的比特率实测值的溶液,

1080以5.0 Mbps的比特率工作,

1600x900的作品具有2.5 Mbps的比特率,

720p的作品1.25比特率Mbps ...