Vfrdtyky

I'd like to succeed writing a file with OpenCV encoding with GStreamer.

Thus I'm using the code :

VideoWriter.open("appsrc ! autovideoconvert ! omxh264enc ! matroskamux ! filesink location=test2.mkv sync=false",

//cv::CAP_GSTREAMER, //set or not, I get the same problem

0, (double)25, //fourcc, fps

cv::Size(1024, 1024), 

true);

And my problem :

A video file called appsrc ! autovideoconvert ! omxh264enc ! matroskamux ! filesink location=test2.mkv sync=false is created (rather than test2.mkv), and it is empty. The same problem is corrected and seems to work in the following thread, without any effect for me : Opening a GStreamer pipeline from OpenCV with VideoWriter

I tried, without success :

• Add quotes to the file name test2 :
  "appsrc ! autovideoconvert ! omxh264enc ! matroskamux ! filesink location="test2.mkv" sync=false" neither


• Encode with different format : .flv rather than .mkv


• Encode with different codec : omxh265enc rather than omxh264en

I checked :

• 
  

  That GStreamer is well compiled with OpenCV ; the CMake of the OpenCV project outputs :

  
  
  

  Video I/O:Video for Windows: YES
  DC1394: NO
  FFMPEG: YES (prebuilt binaries)
  avcodec: YES (ver 57.107.100)
  avformat: YES (ver 57.83.100)
  avutil: YES (ver 55.78.100)
  swscale: YES (ver 4.8.100)
  avresample: YES (ver 3.7.0)
  GStreamer:

  
  
  

  base: YES (ver 1.0)

  
  
  

  video: YES (ver 1.0)

  
  
  

  app: YES (ver 1.0)

  
  
  

  riff: YES (ver 1.0)

  
  
  

  pbutils: YES (ver 1.0)

  
  
  

  DirectShow: YES

  
  
  

  Media Foundation: YES

  
  


• 
  

  That FFMpeg is installed on my computer ; for this I used VLC :

  
  
  

  File -> Stream -> Add a file then stream
  New destination : RTP/MPEG Transport Stream
  Profile : Video - H.264 + MP3 (MP4)
  Then no error happens ; Note : an error occured with Video - H.265 + MP3
  (MP4), but I'm using omxh264enc in my code, not 265

  
  

I'm struggled :/ Do you have any idea ?
Thanks a lot :)

Have a good day,

Thibaut

PS - Complete OpenCV CMake output :

Selecting Windows SDK version 10.0.17134.0 to target Windows 10.0.17763.

AVX_512F is not supported by C++ compiler



AVX512_SKX is not supported by C++ compiler



Dispatch optimization AVX512_SKX is not available, skipped



libjpeg-turbo: VERSION = 1.5.3, BUILD = opencv-3.4.3-libjpeg-turbo



Looking for Mfapi.h



Looking for Mfapi.h - found



found Intel IPP (ICV version): 2017.0.3 [2017.0.3]



at: E:/OpenCV/3.4.3/build-cuda92-gstreamer/3rdparty/ippicv/ippicv_win



found Intel IPP IW sources: 2017.0.3



at: E:/OpenCV/3.4.3/build-cuda92-gstreamer/3rdparty/ippicv/ippiw_win



CUDA detected: 9.2



CUDA NVCC target flags: -gencode;arch=compute_30,code=sm_30;-gencode;arch=compute_35,code=sm_35;-gencode;arch=compute_37,code=sm_37;-gencode;arch=compute_50,code=sm_50;-gencode;arch=compute_52,code=sm_52;-gencode;arch=compute_60,code=sm_60;-gencode;arch=compute_61,code=sm_61;-gencode;arch=compute_70,code=sm_70;-D_FORCE_INLINES



Found apache ant: C:/NVPACK/apache-ant-1.8.2/bin/ant.bat (1.8.2)



Could NOT find Matlab (missing: MATLAB_MEX_SCRIPT MATLAB_INCLUDE_DIRS MATLAB_ROOT_DIR MATLAB_LIBRARIES MATLAB_LIBRARY_DIRS MATLAB_MEXEXT MATLAB_ARCH MATLAB_BIN)



VTK is not found. Please set -DVTK_DIR in CMake to VTK build directory, or to VTK install subdirectory with VTKConfig.cmake file



Caffe: NO



Protobuf: NO



Glog: YES



freetype2: NO



harfbuzz: NO



Module opencv_ovis disabled because OGRE3D was not found



No preference for use of exported gflags CMake configuration set, and no hints for include/library directories provided. Defaulting to preferring an installed/exported gflags CMake configuration if available.



Found installed version of gflags: E:/Git/gflags/BUILD-VS2015



Detected gflags version: 2.2.1



Checking SFM deps... FALSE



Module opencv_sfm disabled because the following dependencies are not found: Eigen Glog/Gflags



Excluding from source files list: <BUILD>/modules/dnn/layers/layers_common.avx512_skx.cpp



Tesseract: NO





General configuration for OpenCV 3.4.3 =====================================



Version control: unknown





Extra modules:



Location (extra): E:/OpenCV/3.4.3/opencv_contrib-3.4.3/modules



Version control (extra): unknown





Platform:



Timestamp: 2018-11-07T16:57:18Z



Host: Windows 10.0.17763 AMD64



CMake: 3.12.0-rc2



CMake generator: Visual Studio 14 2015 Win64



CMake build tool: C:/Program Files (x86)/MSBuild/14.0/bin/MSBuild.exe



MSVC: 1900





CPU/HW features:



Baseline: SSE SSE2 SSE3



requested: SSE3



Dispatched code generation: SSE4_1 SSE4_2 FP16 AVX AVX2



requested: SSE4_1 SSE4_2 AVX FP16 AVX2 AVX512_SKX



SSE4_1 (5 files): + SSSE3 SSE4_1



SSE4_2 (2 files): + SSSE3 SSE4_1 POPCNT SSE4_2



FP16 (2 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 AVX



AVX (6 files): + SSSE3 SSE4_1 POPCNT SSE4_2 AVX



AVX2 (11 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2





C/C++:



Built as dynamic libs?: YES



C++11: YES



C++ Compiler: C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/bin/x86_amd64/cl.exe (ver 19.0.24215.1)



C++ flags (Release): /DWIN32 /D_WINDOWS /W4 /GR /D _CRT_SECURE_NO_DEPRECATE /D _CRT_NONSTDC_NO_DEPRECATE /D _SCL_SECURE_NO_WARNINGS /Gy /bigobj /Oi /EHa /wd4127 /wd4251 /wd4324 /wd4275 /wd4512 /wd4589 /MP16 /MD /O2 /Ob2 /DNDEBUG



C++ flags (Debug): /DWIN32 /D_WINDOWS /W4 /GR /D _CRT_SECURE_NO_DEPRECATE /D _CRT_NONSTDC_NO_DEPRECATE /D _SCL_SECURE_NO_WARNINGS /Gy /bigobj /Oi /EHa /wd4127 /wd4251 /wd4324 /wd4275 /wd4512 /wd4589 /MP16 /MDd /Zi /Ob0 /Od /RTC1



C Compiler: C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/bin/x86_amd64/cl.exe



C flags (Release): /DWIN32 /D_WINDOWS /W3 /D _CRT_SECURE_NO_DEPRECATE /D _CRT_NONSTDC_NO_DEPRECATE /D _SCL_SECURE_NO_WARNINGS /Gy /bigobj /Oi /MP16 /MD /O2 /Ob2 /DNDEBUG



C flags (Debug): /DWIN32 /D_WINDOWS /W3 /D _CRT_SECURE_NO_DEPRECATE /D _CRT_NONSTDC_NO_DEPRECATE /D _SCL_SECURE_NO_WARNINGS /Gy /bigobj /Oi /MP16 /MDd /Zi /Ob0 /Od /RTC1



Linker flags (Release): /machine:x64 /INCREMENTAL:NO



Linker flags (Debug): /machine:x64 /debug /INCREMENTAL



ccache: NO



Precompiled headers: YES



Extra dependencies: cudart.lib nppc.lib nppial.lib nppicc.lib nppicom.lib nppidei.lib nppif.lib nppig.lib nppim.lib nppist.lib nppisu.lib nppitc.lib npps.lib cublas.lib cufft.lib -LIBPATH:C:/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v9.2/lib/x64



3rdparty dependencies:





OpenCV modules:



To be built: aruco bgsegm bioinspired calib3d ccalib core cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev datasets dnn dnn_objdetect dpm face features2d flann fuzzy hfs highgui img_hash imgcodecs imgproc java java_bindings_generator line_descriptor ml objdetect optflow phase_unwrapping photo plot python_bindings_generator reg rgbd saliency shape stereo stitching structured_light superres surface_matching text tracking ts video videoio videostab xfeatures2d ximgproc xobjdetect xphoto



Disabled: js world



Disabled by dependency: -



Unavailable: cnn_3dobj cvv freetype hdf matlab ovis python2 python3 sfm viz



Applications: tests perf_tests apps



Documentation: NO



Non-free algorithms: NO





Windows RT support: NO





GUI:



Win32 UI: YES



VTK support: NO





Media I/O:



ZLib: build (ver 1.2.11)



JPEG: build-libjpeg-turbo (ver 1.5.3-62)



WEBP: build (ver encoder: 0x020e)



PNG: build (ver 1.6.34)



TIFF: build (ver 42 - 4.0.9)



JPEG 2000: build (ver 1.900.1)



OpenEXR: build (ver 1.7.1)



HDR: YES



SUNRASTER: YES



PXM: YES





Video I/O:



Video for Windows: YES



DC1394: NO



FFMPEG: YES (prebuilt binaries)



avcodec: YES (ver 57.107.100)



avformat: YES (ver 57.83.100)



avutil: YES (ver 55.78.100)



swscale: YES (ver 4.8.100)



avresample: YES (ver 3.7.0)



GStreamer:



base: YES (ver 1.0)



video: YES (ver 1.0)



app: YES (ver 1.0)



riff: YES (ver 1.0)



pbutils: YES (ver 1.0)



DirectShow: YES



Media Foundation: YES





Parallel framework: Concurrency





Trace: YES (with Intel ITT)





Other third-party libraries:



Intel IPP: 2017.0.3 [2017.0.3]



at: E:/OpenCV/3.4.3/build-cuda92-gstreamer/3rdparty/ippicv/ippicv_win



Intel IPP IW: sources (2017.0.3)



at: E:/OpenCV/3.4.3/build-cuda92-gstreamer/3rdparty/ippicv/ippiw_win



Custom HAL: NO



Protobuf: build (3.5.1)





NVIDIA CUDA: YES (ver 9.2, CUFFT CUBLAS NVCUVID)



NVIDIA GPU arch: 30 35 37 50 52 60 61 70



NVIDIA PTX archs:





OpenCL: YES (no extra features)



Include path: E:/OpenCV/3.4.3/opencv-3.4.3/3rdparty/include/opencl/1.2



Link libraries: Dynamic load





Python (for build): C:/ProgramData/Miniconda3/python.exe





Java:



ant: C:/NVPACK/apache-ant-1.8.2/bin/ant.bat (ver 1.8.2)



JNI: C:/NVPACK/jdk1.8.0_77/include C:/NVPACK/jdk1.8.0_77/include/win32 C:/NVPACK/jdk1.8.0_77/include



Java wrappers: YES



Java tests: YES





Matlab: NO





Install to: E:/OpenCV/3.4.3/build/install



-----------------------------------------------------------------





Configuring done

Nobody has a little idea of the bug origin ?

Ok, I've eventually found the problem's origin.

By stepping into VideoWriter::open(...) I finally noticed that std::vector backends did not contain any element with "id=CAP_GSTREAMER" -> it did not correctly compile with OpenCV. By investigating more, I discovered it was because I compiled with the x86 version of Gstreamer by mistake (whereas I was building OpenCV for x64).

Have a good day,

Thibaut