H264 CUDA stream decoder problem

Accelerated Computing CUDA CUDA Programming and Performance
1

I have a problem when I decode H264 stream data with nvidia video decoding library.

I modified cudaDecodeGL sample source in order to feed stream data from CCTV, not video file.

I saved the first frame as a file and then loaded that file to initialize decoder and the way is exactly the same as cudaDecodeGL sample source.

And then I put the stream data into the decoder.

The following is my feeding source code.

void CCudaDecoder::FuncDecodePicture(unsigned char* pBitstreamData, unsigned int nBitstreamDataLen)

{

VideoSourceData videoSouceData = { g_pVideoParser->hParser_, g_pFrameQueue };

CUVIDSOURCEDATAPACKET dataPacket = { 0, nBitstreamDataLen, pBitstreamData, 0 };

g_pVideoSource->HandleVideoData(&videoSouceData, &dataPacket);

return;

}

But this code is not working properly.

As soon as I made my function call, VideoParser calls the following function; “VideoDecoder::decodePicture(CUVIDPICPARAMS * pPictureParameters, CUcontext * pContext)”

However nothing happens in FrameQueue even though decodePicture function returns CUDA_SUCCESS.

It was supposed to be called “HandlePictureDisplay” function and then enqueue the decoded frame to the frameQueue.

If I change my code like this

CUVIDSOURCEDATAPACKET dataPacket = { CUVID_PKT_ENDOFSTREAM, nBitstreamDataLen, pBitstreamData, 0 };

, the first frame is decoded and enqueue the frameQueue.

But the first frame only changed.

Even the decodePicture function does not called after I changed the code.

The data is absolutely correct!

Because it works well in any other libraries.

Please let me know what I can do to solve this problem.

Thank you in advance.

2

Depending on your data format, if you’re passing in your first frame and it’s not a keyframe, then it won’t be decoded. If you’re doing streaming, it’s possible that this could happen.
The CUVID library is a black box, and the users only way of interacting with it is though those user-defined asynchronous callback functions. If it’s not triggering your callback function in the next stage of the decoding pipeline, then it means the CUVID library failed somewhere between there.

3

Hi sky0714

Were you able to solve this issue. I am also trying to do the same thing here and don’t know how to proceed.

Thanks

4

Hi,

I’m currently facing the same issue of the callbacks not being triggered. Did anyone have to initialize the decoder? additionally, were you able to resolve this issue?