NVencs输出位流不可读

我有一个问题与Nvidias NVenc API有关。我想使用API对一些OpenGL图形进行编码。我的问题是，API在整个程序中没有报告错误，一切似乎都很好。但是生成的输出是不可读的，例如VLC。如果我尝试播放生成的文件，VLC会在黑屏上闪烁大约0.5秒，然后结束播放。视频的长度为0，视频的大小似乎也很小。分辨率为1280*720，5秒记录的大小仅为700kb。这现实吗？

应用程序的流程如下：

1. 渲染到辅助帧缓冲区
2. 将Framebuffer下载到两个PBO之一（glReadPixels（））
3. 映射上一帧的PBO，以获得Cuda可以理解的指针
4. 调用一个简单的CudaKernel，将OpenGL的RGBA转换为ARGB，NVenc应该可以理解这一点（第18页）。内核读取PBO的内容，并将转换后的内容写入CudaArray（使用cudaMalloc创建），该数组在NVenc注册为InputResource
5. 转换后的数组的内容将被编码。一个完成事件加上相应的输出比特流缓冲区进入队列
6. 辅助线程侦听排队的输出事件，如果有一个事件被发出信号，则输出比特流被映射并写入hdd

NVenc编码器的初始化：

InitParams* ip = new InitParams();
m_initParams = ip;
memset(ip, 0, sizeof(InitParams));
ip->version = NV_ENC_INITIALIZE_PARAMS_VER;
ip->encodeGUID = m_encoderGuid;  //Used Codec
ip->encodeWidth = width; // Frame Width
ip->encodeHeight = height; // Frame Height
ip->maxEncodeWidth = 0; // Zero means no dynamic res changes
ip->maxEncodeHeight = 0; 
ip->darWidth = width; // Aspect Ratio
ip->darHeight = height; 
ip->frameRateNum = 60; // 60 fps
ip->frameRateDen = 1; 
ip->reportSliceOffsets = 0; // According to programming guide
ip->enableSubFrameWrite = 0;
ip->presetGUID = m_presetGuid; // Used Preset for Encoder Config
NV_ENC_PRESET_CONFIG presetCfg; // Load the Preset Config
memset(&presetCfg, 0, sizeof(NV_ENC_PRESET_CONFIG));
presetCfg.version = NV_ENC_PRESET_CONFIG_VER;
presetCfg.presetCfg.version = NV_ENC_CONFIG_VER;
CheckApiError(m_apiFunctions.nvEncGetEncodePresetConfig(m_Encoder,
    m_encoderGuid, m_presetGuid, &presetCfg));
memcpy(&m_encodingConfig, &presetCfg.presetCfg, sizeof(NV_ENC_CONFIG));
// And add information about Bitrate etc
m_encodingConfig.rcParams.averageBitRate = 500000;
m_encodingConfig.rcParams.maxBitRate = 600000;
m_encodingConfig.rcParams.rateControlMode = NV_ENC_PARAMS_RC_MODE::NV_ENC_PARAMS_RC_CBR;
ip->encodeConfig = &m_encodingConfig;
ip->enableEncodeAsync = 1; // Async Encoding
ip->enablePTD = 1; // Encoder handles picture ordering

CudaResource的注册

m_cuContext->SetCurrent(); // Make the clients cuCtx current
NV_ENC_REGISTER_RESOURCE res;
memset(&res, 0, sizeof(NV_ENC_REGISTER_RESOURCE));
NV_ENC_REGISTERED_PTR resPtr; // handle to the cuda resource for future use
res.bufferFormat = m_inputFormat; // Format is ARGB
res.height = m_height;
res.width = m_width;
// NOTE: I've set the pitch to the width of the frame, because the resource is a non-pitched 
//cudaArray. Is this correct? Pitch = 0 would produce no output.
res.pitch = pitch; 
res.resourceToRegister = (void*) (uintptr_t) resourceToRegister; //CUdevptr to resource
res.resourceType = 
    NV_ENC_INPUT_RESOURCE_TYPE::NV_ENC_INPUT_RESOURCE_TYPE_CUDADEVICEPTR;
res.version = NV_ENC_REGISTER_RESOURCE_VER;
CheckApiError(m_apiFunctions.nvEncRegisterResource(m_Encoder, &res));
m_registeredInputResources.push_back(res.registeredResource);

编码

m_cuContext->SetCurrent(); // Make Clients context current
MapInputResource(id); //Map the CudaInputResource
NV_ENC_PIC_PARAMS temp;
memset(&temp, 0, sizeof(NV_ENC_PIC_PARAMS));
temp.version = NV_ENC_PIC_PARAMS_VER;
unsigned int currentBufferAndEvent = m_counter % m_registeredEvents.size(); //Counter is inc'ed in every Frame
temp.bufferFmt = m_currentlyMappedInputBuffer.mappedBufferFmt;
temp.inputBuffer = m_currentlyMappedInputBuffer.mappedResource; //got set by MapInputResource
temp.completionEvent = m_registeredEvents[currentBufferAndEvent];
temp.outputBitstream = m_registeredOutputBuffers[currentBufferAndEvent];
temp.inputWidth = m_width;
temp.inputHeight = m_height;
temp.inputPitch = m_width;
temp.inputTimeStamp = m_counter;
temp.pictureStruct = NV_ENC_PIC_STRUCT_FRAME; // According to samples
temp.qpDeltaMap = NULL;
temp.qpDeltaMapSize = 0;
EventWithId latestEvent(currentBufferAndEvent,
    m_registeredEvents[currentBufferAndEvent]);
PushBackEncodeEvent(latestEvent); // Store the Event with its ID in a Queue
CheckApiError(m_apiFunctions.nvEncEncodePicture(m_Encoder, &temp));
m_counter++;
UnmapInputResource(id); // Unmap

每一个小提示，在哪里看，都是非常感激的。我想不出可能出了什么问题。

非常感谢！