ffmpeg支持mpeg4，openh264，x264编码器实践

参考 Ubuntu20.04 编译安装 FFmpeg 详细教程_ffmpeg --enable-sdl-优快云博客

1，更新Ubuntu环境

更新清华源，中科大源

2，下载FFMPEG代码

3，安装yasm nasm

sudo apt install yasm 

sudo apt intall nasm

4，安装依赖库

sudo apt-get install libgmp3-dev
sudo apt install pkg-config
sudo apt install gnutls-bin
sudo aptitude install libaom-dev
sudo aptitude install libass-dev
sudo aptitude install libbluray-dev
sudo aptitude install libfdk-aac-dev
sudo aptitude install libmp3lame-dev
sudo aptitude install libopencore-amrnb-dev
sudo aptitude install libopencore-amrwb-dev
sudo aptitude install libopenmpt-dev
sudo aptitude install libopus-dev
sudo aptitude install libshine-dev
sudo aptitude install libsnappy-dev
sudo aptitude install libsoxr-dev
sudo aptitude install libspeex-dev
sudo aptitude install libtheora-dev
sudo aptitude install libtwolame-dev
sudo aptitude install libvo-amrwbenc-dev
sudo aptitude install llibvpx-dev
sudo aptitude install libwavpack-dev
sudo aptitude install libwebp-dev
sudo aptitude install libx264-dev
sudo aptitude install libx265-dev
sudo aptitude install libxvidcore-dev
sudo aptitude install liblzma-dev

5，安装gcc g++

sudo aptitude install build-essential

6，下载SDL2

有些朋友肯定好奇，我们明明在编译安装 FFmpeg,这里为什么要下载 SDL2。这是因为，SDL是编译 ffplayer 所必须的外部库，而 Ubuntu 环境并不会对其默认安装，故而需要用户手动安装。而 SDL1 有些过时，目前使用广泛的是 SDL2，因此这里推荐安装SDL2。

SDL 下载地址:http://www.libsdl.org/download-2.0.php
下载后，同样解压，然后进入加压目录
S1执行命令：./configure --prefix=/usr/local
S2执行命令：sudo make
S3执行命令：sudo make install
 

7，编译 FFMPEG

./configure --enable-gpl  --enable-libass  --enable-libfdk-aac  --enable-libfreetype  --enable-libmp3lame   --enable-libopus  --enable-libvorbis  --enable-libvpx  --enable-libx264  --enable-libx265  --enable-nonfree

8,opencv编译

cmake \
-D CMAKE_BUILD_TYPE=RELEASE \
-D CMAKE_INSTALL_PREFIX=/usr/local \
-D INSTALL_PYTHON_EXAMPLES=ON \
-D INSTALL_C_EXAMPLES=ON \
-D BUILD_DOCS=OFF \
-D BUILD_PERF_TESTS=OFF \
-D BUILD_TESTS=OFF \
-D BUILD_PACKAGE=OFF \
-D BUILD_EXAMPLES=OFF \
-D WITH_TBB=ON \
-D ENABLE_FAST_MATH=1 \
-D CUDA_FAST_MATH=1 \
-D WITH_CUDA=ON \
-D WITH_CUBLAS=ON \
-D WITH_CUFFT=ON \
-D WITH_NVCUVID=ON \
-D WITH_IPP=OFF \
-D WITH_V4L=ON \
-D WITH_1394=OFF \
-D WITH_GTK=ON \
-D WITH_QT=OFF \
-D WITH_OPENGL=ON \
-D WITH_EIGEN=ON \
-D WITH_FFMPEG=ON \
-D WITH_GSTREAMER=ON \
-D BUILD_JAVA=OFF \
-D BUILD_opencv_python3=ON \
-D BUILD_opencv_python2=OFF \
-D BUILD_NEW_PYTHON_SUPPORT=ON \
-D OPENCV_SKIP_PYTHON_LOADER=ON \
-D OPENCV_GENERATE_PKGCONFIG=ON \
-D OPENCV_ENABLE_NONFREE=ON \
-D OPENCV_EXTRA_MODULES_PATH=~/github/opencv_contrib-4.8.1/modules \
-D WITH_CUDNN=ON \
-D OPENCV_DNN_CUDA=ON \
-D CUDA_ARCH_BIN=8.6 \
-D CUDA_ARCH_PTX=8.6 \
-D CUDA_TOOLKIT_ROOT_DIR=/usr/local/cuda-11.7/ \
-D PYTHON_DEFAULT_EXECUTABLE=$(python3 -c "import sys; print(sys.executable)") \
-D PYTHON3_EXECUTABLE=$(python3 -c "import sys; print(sys.executable)") \
-D PYTHON3_NUMPY_INCLUDE_DIRS=$(python3 -c "import numpy; print (numpy.get_include())") \
-D PYTHON3_PACKAGES_PATH=$(python3 -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())")  ..

opencv 编译：

make -j"$(nproc)"