CV :: cudacodec :: VideoReader無法發揮RTSP流

Question

系統信息

• 的OpenCV => 3.3.0
• 操作系統/平臺=> Ubuntu的16.04，x86_64的
• 編譯=> gcc版本5.4.1 20160904
• Cuda的=> 8.0
• 的Nvidia卡=> GTX 1080的Ti
• ffmpeg的細節
  • libavutil 55. 74.100/74.100 55.
  • libavcodec的57.103.100/57.103.100
  • 了libavformat 57. 77.100/77.100 57.
  • libavdevice 57. 7.101/57 7.101
  • libavfilter 6.100.100/6.100.100
  • libswscale 4. 7.103/4 7.103
  • libswresample 2. 8.100/2 8.100

我試圖發揮使用cudacodec::VideoReader

RTSP流的詳細信息（從VLC）的RTSP流的詳細描述

這個流中VLC和cv::VideoCapture正常播放，但當我嘗試播放它在cudacodec::VideoReader我得到一個錯誤說：

OpenCV Error: Gpu API call (CUDA_ERROR_FILE_NOT_FOUND [Code = 301]) in CuvidVideoSource, file /home/deep/Development/libraries/opencv/opencv/modules/cudacodec/src/cuvid_video_source.cpp, line 66

OpenCV Error: Assertion failed (init_MediaStream_FFMPEG()) in FFmpegVideoSource, file /home/deep/Development/libraries/opencv/opencv/modules/cudacodec/src/ffmpeg_video_source.cpp, line 101

步驟來重現

#include <iostream> 
#include "opencv2/opencv_modules.hpp" 

#if defined(HAVE_OPENCV_CUDACODEC) 

#include <opencv2/core.hpp> 
#include <opencv2/cudacodec.hpp> 
#include <opencv2/highgui.hpp> 

int main(int argc, const char* argv[]) 
{ 
    const std::string fname = "rtsp://admin:admin@192.168.1.13/media/video2"; 

    cv::namedWindow("GPU", cv::WINDOW_NORMAL); 

    cv::cuda::GpuMat d_frame; 
    cv::Ptr<cv::cudacodec::VideoReader> d_reader = cv::cudacodec::createVideoReader(fname); 

    for (;;) 
    { 

     if (!d_reader->nextFrame(d_frame)) 
      break; 

     cv::Mat frame; 
     d_frame.download(frame); 
     cv::imshow("GPU", frame); 

     if (cv::waitKey(3) > 0) 
      break; 
    } 
    return 0; 
} 

#else 
int main() 
{ 
    std::cout << "OpenCV was built without CUDA Video decoding support\n" << std::endl; 
    return 0; 
} 
#endif 

我嘗試使用gdb調試，並看到，在ffmpeg_video_source.cppbool init_MediaStream_FFMPEG()直接返回而不檢查，如果條件。

GDB輸出

cv::cudacodec::detail::FFmpegVideoSource::FFmpegVideoSource 
(this=0x402a20 <_start>, fname=...) at /home/deep/Development/libraries/opencv/opencv/modules/cudacodec/src/ffmpeg_video_source.cpp:98 
98  cv::cudacodec::detail::FFmpegVideoSource::FFmpegVideoSource(const String& fname) : 
(gdb) n 
99   stream_(0) 
(gdb) n 
101   CV_Assert(init_MediaStream_FFMPEG()); 
(gdb) s 
(anonymous namespace)::init_MediaStream_FFMPEG() at /home/deep/Development/libraries/opencv/opencv/modules/cudacodec/src/ffmpeg_video_source.cpp:94 
94    return initialized; 
(gdb) display initialized 
4: initialized = false 
(gdb) s 
95   } 

UPDATE：

我已經解決了這個問題。 solution link

Answer 1

在提供的解決方案here的解決方案中，問題與ffmpeg檢測到的像素格式有關。

爲了檢查您的rtsp像素格式，您可以使用ffprobe。 然後你cap_ffmpeg_impl.hpp你應該添加與您的像素格式的情況下像

case AV_PIX_FMT_YUV420P: 
case AV_PIX_FMT_YUVJ420P: 
    *chroma_format = ::VideoChromaFormat_YUV420; 
    break; 

，然後重建OpenCV的內部。