0 c++ opencv cuda nvidia cmake
大家好，感谢您的回答
首先，正如@zkoza和@talonmies指出的那样，Jetson AGX Xavier 与 ARCH 7.2 兼容，而不是 Jetson Nano 案例中使用的 ARCH 5.3。
对于@Yunus Temurlenk =>我的代码中的fname只是myvideo.MOV，因为我在电影的同一剧目中执行我的代码，我还尝试使用从互联网样本中获取的.mp4文件，导致相同的错误。是的，正如您所指出的，在 cmake 命令之后我的 NVCUVID 未打开，正如您在我的原始帖子中看到的，与 CUDA 对应的行是
NVIDIA CUDA: YES (ver 10.2, CUFFT CUBLAS FAST_MATH)
并不是
NVIDIA CUDA: YES (ver 10.2, CUFFT NVCUVID CUBLAS FAST_MATH)
我不知道缺少哪些依赖项，但我还在这里看到 NVCUVID 已被弃用： https: //docs.nvidia.com/cuda/video-decoder/index.html
cuda 第 6 步中的示例工作正常:) 我目前正在使用 cuda 10.2 制作 opencv 4.3.0，如果这解决了我的问题，我将更新我的答案。
编辑：不幸的是，在 Ubuntu 18.04 上使用 openCV 4.3.0 和 Cuda 10.2 时，问题完全相同，但我想补充一点，我使用此命令进行编译：
g++ video_reader.cpp -o vr.exe `pkg-config --cflags --libs opencv4`
因为 g++ 本身给了我这个错误：
video_reader.cpp:3:10: fatal error: opencv2/opencv_modules.hpp: No such file or directory
#include "opencv2/opencv_modules.hpp"
^~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
那么，也许我的编译命令有问题？
结束编辑
对于 @user2986898 和 @einpoklum =>我运行了 cv::getBuildInformation() 和其他 2 个函数：设备数量和兼容设备数量。设备和兼容设备的数量如预期为 1，构建信息为：
General configuration for OpenCV 4.5.1 =====================================
Version control: unknown
Extra modules:
Location (extra): /home/dronemaitre/Documents/opencv_cpp/opencv_contrib/modules
Version control (extra): unknown
Platform:
Timestamp: 2021-01-18T10:12:44Z
Host: Linux 4.9.140-tegra aarch64
CMake: 3.10.2
CMake generator: Unix Makefiles
CMake build tool: /usr/bin/make
Configuration: RELEASE
CPU/HW features:
Baseline: NEON FP16
C/C++:
Built as dynamic libs?: YES
C++ standard: 11
C++ Compiler: /usr/bin/c++ (ver 7.5.0)
C++ flags (Release): -fsigned-char -ffast-math -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG
C++ flags (Debug): -fsigned-char -ffast-math -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D_DEBUG
C Compiler: /usr/bin/cc
C flags (Release): -fsigned-char -ffast-math -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -O3 -DNDEBUG -DNDEBUG
C flags (Debug): -fsigned-char -ffast-math -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -g -O0 -DDEBUG -D_DEBUG
Linker flags (Release): -Wl,--gc-sections -Wl,--as-needed
Linker flags (Debug): -Wl,--gc-sections -Wl,--as-needed
ccache: NO
Precompiled headers: NO
Extra dependencies: m pthread /usr/lib/aarch64-linux-gnu/libGL.so /usr/lib/aarch64-linux-gnu/libGLU.so cudart_static dl rt nppc nppial nppicc nppicom nppidei nppif nppig nppim nppist nppisu nppitc npps cublas cudnn cufft -L/usr/local/cuda-10.2/lib64 -L/usr/lib/aarch64-linux-gnu
3rdparty dependencies:
OpenCV modules:
To be built: alphamat aruco bgsegm bioinspired calib3d ccalib core cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev cvv datasets dnn dnn_objdetect dnn_superres dpm face features2d flann freetype fuzzy gapi hdf hfs highgui img_hash imgcodecs imgproc intensity_transform line_descriptor mcc ml objdetect optflow phase_unwrapping photo plot python2 python3 quality rapid reg rgbd saliency sfm shape stereo stitching structured_light superres surface_matching text tracking ts video videoio videostab xfeatures2d ximgproc xobjdetect xphoto
Disabled: world
Disabled by dependency: -
Unavailable: cnn_3dobj java julia matlab ovis viz
Applications: tests perf_tests apps
Documentation: NO
Non-free algorithms: NO
GUI:
QT: YES (ver 5.9.5)
QT OpenGL support: YES (Qt5::OpenGL 5.9.5)
GTK+: NO
OpenGL support: YES (/usr/lib/aarch64-linux-gnu/libGL.so /usr/lib/aarch64-linux-gnu/libGLU.so)
VTK support: NO
Media I/O:
ZLib: /usr/lib/aarch64-linux-gnu/libz.so (ver 1.2.11)
JPEG: /usr/lib/aarch64-linux-gnu/libjpeg.so (ver 80)
WEBP: build (ver encoder: 0x020f)
PNG: /usr/lib/aarch64-linux-gnu/libpng.so (ver 1.6.34)
TIFF: /usr/lib/aarch64-linux-gnu/libtiff.so (ver 42 / 4.0.9)
JPEG 2000: build (ver 2.3.1)
OpenEXR: build (ver 2.3.0)
HDR: YES
SUNRASTER: YES
PXM: YES
PFM: YES
Video I/O:
DC1394: YES (2.2.5)
FFMPEG: YES
avcodec: YES (57.107.100)
avformat: YES (57.83.100)
avutil: YES (55.78.100)
swscale: YES (4.8.100)
avresample: YES (3.7.0)
GStreamer: YES (1.14.5)
v4l/v4l2: YES (linux/videodev2.h)
Parallel framework: TBB (ver 2017.0 interface 9107)
Trace: YES (with Intel ITT)
Other third-party libraries:
Lapack: NO
Eigen: YES (ver 3.3.4)
Custom HAL: YES (carotene (ver 0.0.1))
Protobuf: build (3.5.1)
NVIDIA CUDA: YES (ver 10.2, CUFFT CUBLAS FAST_MATH)
NVIDIA GPU arch: 72
NVIDIA PTX archs:
cuDNN: YES (ver 8.0.0)
OpenCL: YES (no extra features)
Include path: /home/dronemaitre/Documents/opencv_cpp/opencv/3rdparty/include/opencl/1.2
Link libraries: Dynamic load
Python 2:
Interpreter: /usr/bin/python2.7 (ver 2.7.17)
Libraries: /usr/lib/aarch64-linux-gnu/libpython2.7.so (ver 2.7.17)
numpy: /usr/lib/python2.7/dist-packages/numpy/core/include (ver 1.13.3)
install path: lib/python2.7/dist-packages/cv2/python-2.7
Python 3:
Interpreter: /usr/bin/python3 (ver 3.6.9)
Libraries: /usr/lib/aarch64-linux-gnu/libpython3.6m.so (ver 3.6.9)
numpy: /usr/lib/python3/dist-packages/numpy/core/include (ver 1.13.3)
install path: lib/python3.6/dist-packages/cv2/python-3.6
Python (for build): /usr/bin/python2.7
Java:
ant: NO
JNI: NO
Java wrappers: NO
Java tests: NO
Install to: /usr/local
-----------------------------------------------------------------
看来 Cuda 是由 OpenCV 找到的，但在这里我们再次可以看到 NVCUVID 没有添加，所以我把 -D NVCUVID=ON 正如你所说，它可能会被忽略，因为与我的配置不兼容。 编辑：在我的构建文件夹中运行的 ccmake 命令给出了以下输出：
ANT_EXECUTABLE ANT_EXECUTABLE-NOTFOUND
Atlas_BLAS_LIBRARY /usr/lib/aarch64-linux-gnu/libatlas.so
Atlas_CBLAS_INCLUDE_DIR /usr/include/aarch64-linux-gnu
Atlas_CBLAS_LIBRARY /usr/lib/aarch64-linux-gnu/libcblas.so
Atlas_CLAPACK_INCLUDE_DIR Atlas_CLAPACK_INCLUDE_DIR-NOTFOUND
Atlas_LAPACK_LIBRARY /usr/lib/aarch64-linux-gnu/liblapack.so
BUILD_CUDA_STUBS OFF
BUILD_DOCS OFF
BUILD_EXAMPLES OFF
BUILD_ITT ON
BUILD_JASPER OFF
BUILD_JAVA ON
BUILD_JPEG OFF
BUILD_LIST
BUILD_OPENEXR OFF
BUILD_PACKAGE ON
BUILD_PERF_TESTS ON
BUILD_PNG OFF
BUILD_PROTOBUF ON
BUILD_SHARED_LIBS ON
BUILD_TBB OFF
BUILD_TESTS ON
BUILD_TIFF OFF
BUILD_USE_SYMLINKS OFF
BUILD_WEBP OFF
BUILD_WITH_DEBUG_INFO OFF
BUILD_WITH_DYNAMIC_IPP OFF
BUILD_ZLIB OFF
BUILD_opencv_alphamat ON
BUILD_opencv_apps ON
BUILD_opencv_aruco ON
BUILD_opencv_bgsegm ON
BUILD_opencv_bioinspired ON
BUILD_opencv_calib3d ON
BUILD_opencv_ccalib ON
BUILD_opencv_core ON
BUILD_opencv_cudaarithm ON
BUILD_opencv_cudabgsegm ON
BUILD_opencv_cudacodec ON
BUILD_opencv_cudafeatures2d ON
BUILD_opencv_cudafilters ON
BUILD_opencv_cudaimgproc ON
BUILD_opencv_cudalegacy ON
BUILD_opencv_cudaobjdetect ON
BUILD_opencv_cudaoptflow ON
BUILD_opencv_cudastereo ON
BUILD_opencv_cudawarping ON
BUILD_opencv_cudev ON
BUILD_opencv_cvv ON
BUILD_opencv_datasets ON
BUILD_opencv_dnn ON
BUILD_opencv_dnn_objdetect ON
BUILD_opencv_dnn_superres ON
BUILD_opencv_dpm ON
BUILD_opencv_face ON
BUILD_opencv_features2d ON
BUILD_opencv_flann ON
BUILD_opencv_freetype ON
BUILD_opencv_fuzzy ON
BUILD_opencv_gapi ON
BUILD_opencv_hdf ON
BUILD_opencv_hfs ON
BUILD_opencv_highgui ON
BUILD_opencv_img_hash ON
BUILD_opencv_imgcodecs ON
BUILD_opencv_imgproc ON
BUILD_opencv_intensity_transfo ON
BUILD_opencv_java_bindings_gen ON
BUILD_opencv_js OFF
BUILD_opencv_line_descriptor ON
BUILD_opencv_ml ON
BUILD_opencv_objdetect ON
BUILD_opencv_optflow ON
BUILD_opencv_phase_unwrapping ON
BUILD_opencv_photo ON
BUILD_opencv_plot ON
BUILD_opencv_python2 ON
BUILD_opencv_python3 ON
BUILD_opencv_python_bindings_g ON
BUILD_opencv_python_tests ON
BUILD_opencv_quality ON
BUILD_opencv_rapid ON
BUILD_opencv_reg ON
BUILD_opencv_rgbd ON
BUILD_opencv_saliency ON
BUILD_opencv_sfm ON
BUILD_opencv_shape ON
BUILD_opencv_stereo ON
BUILD_opencv_stitching ON
BUILD_opencv_structured_light ON
BUILD_opencv_superres ON
BUILD_opencv_surface_matching ON
BUILD_opencv_text ON
BUILD_opencv_tracking ON
BUILD_opencv_ts ON
BUILD_opencv_video ON
BUILD_opencv_videoio ON
BUILD_opencv_videostab ON
BUILD_opencv_world OFF
BUILD_opencv_xfeatures2d ON
BUILD_opencv_ximgproc ON
BUILD_opencv_xobjdetect ON
BUILD_opencv_xphoto ON
CAROTENE_NS carotene_o4t
CCACHE_PROGRAM CCACHE_PROGRAM-NOTFOUND
CLAMDBLAS_INCLUDE_DIR CLAMDBLAS_INCLUDE_DIR-NOTFOUND
CLAMDBLAS_ROOT_DIR CLAMDBLAS_ROOT_DIR-NOTFOUND
CLAMDFFT_INCLUDE_DIR CLAMDFFT_INCLUDE_DIR-NOTFOUND
CLAMDFFT_ROOT_DIR CLAMDFFT_ROOT_DIR-NOTFOUND
CMAKE_BUILD_TYPE RELEASE
CMAKE_CONFIGURATION_TYPES Debug;Release
CMAKE_INSTALL_PREFIX /usr/local
CPU_BASELINE NEON;FP16
CPU_BASELINE_DISABLE ;VFPV3
CPU_BASELINE_REQUIRE ;NEON
CPU_DISPATCH
CUDA_ARCH_BIN 7.2
CUDA_ARCH_PTX
CUDA_FAST_MATH ON
CUDA_GENERATION
CUDA_HOST_COMPILER /usr/bin/cc
CUDA_TOOLKIT_ROOT_DIR /usr/local/cuda-10.2
CUDA_USE_STATIC_CUDA_RUNTIME ON
CUDA_rt_LIBRARY /usr/lib/aarch64-linux-gnu/librt.so
CV_DISABLE_OPTIMIZATION OFF
CV_ENABLE_INTRINSICS ON
CV_TRACE ON
Caffe_INCLUDE_DIR Caffe_INCLUDE_DIR-NOTFOUND
Caffe_LIBS Caffe_LIBS-NOTFOUND
Ceres_DIR Ceres_DIR-NOTFOUND
ENABLE_BUILD_HARDENING OFF
ENABLE_CCACHE ON
ENABLE_CONFIG_VERIFICATION OFF
ENABLE_COVERAGE OFF
ENABLE_FAST_MATH ON
ENABLE_FLAKE8 OFF
ENABLE_GNU_STL_DEBUG OFF
ENABLE_IMPL_COLLECTION OFF
ENABLE_INSTRUMENTATION OFF
ENABLE_LTO OFF
ENABLE_NEON ON
ENABLE_NOISY_WARNINGS OFF
ENABLE_OMIT_FRAME_POINTER ON
ENABLE_PIC ON
ENABLE_PRECOMPILED_HEADERS OFF
ENABLE_PROFILING OFF
ENABLE_PYLINT OFF
ENABLE_SOLUTION_FOLDERS OFF
ENABLE_VFPV3 OFF
EXECUTABLE_OUTPUT_PATH /home/dronemaitre/Documents/opencv_cpp/opencv/build/bin
Eigen3_DIR /usr/lib/cmake/eigen3
GENERATE_ABI_DESCRIPTOR OFF
Glog_LIBS /usr/lib/aarch64-linux-gnu/libglog.so
HDF5_C_LIBRARY_dl /usr/lib/aarch64-linux-gnu/libdl.so
HDF5_C_LIBRARY_hdf5 /usr/lib/aarch64-linux-gnu/hdf5/serial/libhdf5.so
HDF5_C_LIBRARY_m /usr/lib/aarch64-linux-gnu/libm.so
HDF5_C_LIBRARY_pthread /usr/lib/aarch64-linux-gnu/libpthread.so
HDF5_C_LIBRARY_sz /usr/lib/aarch64-linux-gnu/libsz.so
HDF5_C_LIBRARY_z /usr/lib/aarch64-linux-gnu/libz.so
INSTALL_CREATE_DISTRIB OFF
INSTALL_C_EXAMPLES OFF
INSTALL_PYTHON_EXAMPLES OFF
INSTALL_TESTS OFF
INSTALL_TO_MANGLED_PATHS OFF
LAPACKE_INCLUDE_DIR LAPACKE_INCLUDE_DIR-NOTFOUND
LAPACK_CBLAS_H
LAPACK_IMPL Unknown
LAPACK_INCLUDE_DIR
LAPACK_LAPACKE_H
LAPACK_LIBRARIES
Lept_LIBRARY Lept_LIBRARY-NOTFOUND
MKL_INCLUDE_DIRS MKL_ROOT_DIR-NOTFOUND/include
MKL_LAPACKE_INCLUDE_DIR MKL_LAPACKE_INCLUDE_DIR-NOTFOUND
MKL_ROOT_DIR MKL_ROOT_DIR-NOTFOUND
MKL_WITH_OPENMP OFF
MKL_WITH_TBB OFF
OGRE_DIR OGRE_DIR-NOTFOUND
OPENCL_FOUND ON
OPENCV_CONFIG_FILE_INCLUDE_DIR /home/dronemaitre/Documents/opencv_cpp/opencv/build
OPENCV_DNN_CUDA OFF
OPENCV_DNN_OPENCL ON
OPENCV_DOWNLOAD_PATH /home/dronemaitre/Documents/opencv_cpp/opencv/.cache
OPENCV_DUMP_HOOKS_FLOW OFF
OPENCV_ENABLE_ALLOCATOR_STATS ON
OPENCV_ENABLE_ATOMIC_LONG_LONG OFF
OPENCV_ENABLE_MEMALIGN ON
OPENCV_ENABLE_MEMORY_SANITIZER OFF
OPENCV_ENABLE_NONFREE OFF
OPENCV_EXTRA_MODULES_PATH /home/dronemaitre/Documents/opencv_cpp/opencv_contrib/modules
OPENCV_FORCE_3RDPARTY_BUILD OFF
OPENCV_FORCE_PYTHON_LIBS OFF
OPENCV_GENERATE_PKGCONFIG ON
OPENCV_GENERATE_SETUPVARS ON
OPENCV_JAVA_SOURCE_VERSION
OPENCV_JAVA_TARGET_VERSION
OPENCV_MATHJAX_RELPATH https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0
OPENCV_PYTHON3_VERSION OFF
OPENCV_TIMESTAMP 2021-01-18T12:55:10Z
OPENCV_WARNINGS_ARE_ERRORS OFF
OPENEXR_INCLUDE_PATH OPENEXR_INCLUDE_PATH-NOTFOUND
OpenCV_HAL_DIR OpenCV_HAL_DIR-NOTFOUND
OpenJPEG_DIR OpenJPEG_DIR-NOTFOUND
PROTOBUF_UPDATE_FILES OFF
PYTHON2_EXECUTABLE /usr/bin/python2.7
PYTHON2_INCLUDE_DIR /usr/include/python2.7
小智 5
我花了两周多/几十个小时才终于让它工作（我的配置是相似的）。这就是我所做的（我希望我记住了一切）：
我的系统：i7-4790 上的 Ubuntu 18.04 + GTX1050Ti（驱动程序版本 460.39）+ CUDA 10.2 + OpenCV 4.5.1 + ffmpeg OpenCV 和 ffmpeg 是使用 CUDA 支持构建的。
OpenCV 构建选项：
cmake -D CMAKE_BUILD_TYPE=RELEASE \
-D CMAKE_C_COMPILER=/usr/bin/gcc-7 \
-D CMAKE_INSTALL_PREFIX=/usr/local \
-D INSTALL_PYTHON_EXAMPLES=ON \
-D INSTALL_C_EXAMPLES=ON \
-D WITH_TBB=ON \
-D WITH_CUDA=ON \
-D WITH_NVCUVID=ON \
-D WITH_NVCUVENC=OFF \
-D BUILD_opencv_cudacodec=ON \
-D WITH_CUDNN=OFF \
-D OPENCV_DNN_CUDA=OFF \
-D CUDA_ARCH_BIN=6.1 \
-D ENABLE_FAST_MATH=1 \
-D CUDA_FAST_MATH=1 \
-D WITH_CUBLAS=1 \
-D WITH_V4L=ON \
-D WITH_QT=ON \
-D WITH_OPENGL=ON \
-D WITH_GSTREAMER=ON \
-D OPENCV_GENERATE_PKGCONFIG=ON \
-D OPENCV_PC_FILE_NAME=opencv4.pc \
-D OPENCV_ENABLE_NONFREE=ON \
-D OPENCV_PYTHON3_INSTALL_PATH=/usr/lib/python3.6/site-packages \
-D OPENCV_EXTRA_MODULES_PATH=/path/to/opencv_contrib-4.5.1/modules \
-D PYTHON_EXECUTABLE="/usr/bin/python2" \
-D PYTHON_DEFAULT_EXECUTABLE="/usr/bin/python3" \
-D PYTHON3_EXECUTABLE="/usr/bin/python3" \
-D BUILD_EXAMPLES=ON ..
ffmpeg version N-101174-g14dc28e969 Copyright (c) 2000-2021 the FFmpeg developers
built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
configuration: --prefix=/home/lg/ffmpeg_build2 --pkg-config-flags=--static --extra-cflags=-I/home/lg/ffmpeg_build2/include --extra-ldflags=-L/home/lg/ffmpeg_build2/lib --extra-libs='-lpthread -lm' --bindir=/home/lg/bin2 --enable-cuda --enable-cuvid --enable-libnpp --extra-cflags=-I/usr/local/cuda/include/ --extra-ldflags=-L/usr/local/cuda/lib64/ --enable-gpl --enable-opencl --enable-opengl --enable-libass --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libfdk-aac --enable-libvpx --enable-libx264 --enable-libx265 --enable-nvenc --enable-vaapi --enable-vdpau --enable-nonfree --cpu=native --extra-cflags='-march=native'
cv::cudacodec::createVideoReader()不起作用，错误是 The function/feature is not implemented) The called functionality is disabled for current build or platform in function 'throw_no_cuda'
我下载了 NVIDIA 的 Video_Codec_SDK_10.0.26 并复制nvcuvid.h,cuviddec.h并nvEncodeAPI.h从 /Interface 复制到 CUDA 的 include 目录（在我的例子中/usr/local/cuda-10.2/targets/x86_64-linux/include）和/usr/inlcude. 可能没有必要将所有这些文件都放在两个位置。
再次重新编译OpenCV。设置这两个选项至关重要：
-D WITH_NVCUVID=ON \
-D BUILD_opencv_cudacodec=ON \
如果没有它们，OpenCV 就不会安装 NVCUVID 模块。编译失败并出现错误，它抱怨cudaVideoCodec_AV1文件第 81 行中没有声明或类似的内容。opencv_contrib-4.5.1/modules/cudacodec/src/video_decoder.cpp由于我不打算使用 AV1，所以我只是删除了这一行。之后终于编译成功了。
opencv_contrib-4.5.1/modules/cudacodec/src/ffmpeg_video_source.cpp（我的视频有“hev1”FourCC）。所以我添加了缺少的定义： case CV_FOURCC_MACRO('H', '2', '6', '5'): // fallthru
case CV_FOURCC_MACRO('h', '2', '6', '5'): // fallthru
case CV_FOURCC_MACRO('h', 'e', 'v', 'c'): return HEVC;
变成：
case CV_FOURCC_MACRO('H', '2', '6', '5'): // fallthru
case CV_FOURCC_MACRO('h', '2', '6', '5'): // fallthru
case CV_FOURCC_MACRO('h', 'e', 'v', '1'): // fallthru
case CV_FOURCC_MACRO('h', 'v', 'c', '1'): // fallthru
case CV_FOURCC_MACRO('h', 'e', 'v', 'c'): return HEVC;
然后最后一次重新编译OpenCV，终于一切正常了。
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