ubuntu - 找不到包 - 将 libav 添加到 PKG_CONFIG_PATH 环境变量

Question

我正在尝试构建 Parrot SDK，但在运行命令时，由于未找到多个 libav 包变体，它不断失败。下面是错误信息。

user@TheMysteriousMachine:~/WORKING_DIRECTORY$ ./build.sh -p arsdk-native -t build-sdk -j    [I] Starting task 'build-sdk'    [I] In '/home/user/WORKING_DIRECTORY':   ALCHEMY_TARGET_CONFIG_DIR="/home/user/WORKING_DIRECTORY/products/arsdk  /native/config" ALCHEMY_TARGET_OUT="/home/user/WORKING_DIRECTORY/out/arsdk-native" ALCHEMY_TARGET_PRODUCT="arsdk" ALCHEMY_TARGET_PRODUCT_VARIANT="native" ALCHEMY_TARGET_SCAN_ADD_DIRS=" /home/user/WORKING_DIRECTORY/packages" ALCHEMY_TARGET_SCAN_PRUNE_DIRS=" /home/user/WORKING_DIRECTORY" ALCHEMY_USE_COLORS="1" ALCHEMY_WORKSPACE_DIR="/home/user/WORKING_DIRECTORY" PARROT_BUILD_PROP_GROUP="drones" PARROT_BUILD_PROP_PRODUCT="arsdk" PARROT_BUILD_PROP_PROJECT="arsdk" PARROT_BUILD_PROP_UID="arsdk-native-20190316-1404-0.0.0" PARROT_BUILD_PROP_VARIANT="native" PARROT_BUILD_PROP_VERSION="0.0.0" /home/user/WORKING_DIRECTORY/build/alchemy/scripts/alchemake -j 8 all    ----------------------------------------------------------------------    + ALCHEMY_WORKSPACE_DIR = /home/user /WORKING_DIRECTORY    + TARGET_PRODUCT = arsdk    + TARGET_PRODUCT_VARIANT = native    + TARGET_OS = linux    + TARGET_OS_FLAVOUR = native    + TARGET_LIBC = native    + TARGET_ARCH = x64    + TARGET_CPU =     + TARGET_OUT = /home/user/WORKING_DIRECTORY/out/arsdk-native    + TARGET_CONFIG_DIR = /home/user/WORKING_DIRECTORY /products/arsdk/native/config    + TARGET_CC_PATH = /usr/bin/cc    + TARGET_CC_VERSION = 7    ----------------------------------------------------------------------    Scanning /home/user/WORKING_DIRECTORY/packages for makefiles...    Found 44 makefiles    Prebuilt module ncurses marked as overriden    Prebuilt module ncurses marked as overriden    Package libavcodec was not found in the pkg-config search path.    Perhaps you should add the directory containing libavcodec.pc'
    to the PKG_CONFIG_PATH environment variable
    No package 'libavcodec' found
    Package libavformat was not found in the pkg-config search path.
    Perhaps you should add the directory containinglibavformat.pc'    to the PKG_CONFIG_PATH environment variable    No package 'libavformat' found    Package libswscale was not found in the pkg-config search path.    Perhaps you should add the directory containing libswscale.pc'
    to the PKG_CONFIG_PATH environment variable
    No package 'libswscale' found
    Package libavutil was not found in the pkg-config search path.
    Perhaps you should add the directory containinglibavutil.pc'    to the PKG_CONFIG_PATH environment variable    No package 'libavutil' found    Package libavcodec was not found in the pkg-config search path.    Perhaps you should add the directory containing libavcodec.pc'
    to the PKG_CONFIG_PATH environment variable
    No package 'libavcodec' found
    Package libavformat was not found in the pkg-config search path.
    Perhaps you should add the directory containinglibavformat.pc'    to the PKG_CONFIG_PATH environment variable    No package 'libavformat' found    Package libswscale was not found in the pkg-config search path.    Perhaps you should add the directory containing libswscale.pc'
    to the PKG_CONFIG_PATH environment variable
    No package 'libswscale' found
    Package libavutil was not found in the pkg-config search path.
    Perhaps you should add the directory containinglibavutil.pc'    to the PKG_CONFIG_PATH environment variable    No package 'libavutil' found    Found 96 modules    Computing modules dependencies...    Checking modules dependencies...    /home/user/WORKING_DIRECTORY/build/alchemy/main.mk:360: *** /home/user    /WORKING_DIRECTORY/packages/libARDiscovery: module 'libARDiscovery'     depends on unknown module 'avahi'.  Stop.    [E] Task 'build-sdk' failed (Command     failed (returncode=2))    

据我了解，libav 已被 ffmpeg 取代，但构建仍应能够将这些包引用为 libav。我尝试使用“export PKG_CONFIG_PATH=...”向 PKG_CONFIG_PATH 添加不同的路径，但没有成功。可能我没有添加正确的路径，我使用“dpkg -L ffmpeg”来定位包。其输出是:

user@TheMysteriousMachine:~$ dpkg -L ffmpeg    /.    /etc    /etc/ffserver.conf    /usr    /usr/bin    /usr/bin/ffmpeg    /usr/bin/ffplay    /usr/bin/ffprobe    /usr/bin/ffserver    /usr/bin/qt-faststart    /usr/share    /usr/share/doc    /usr/share/doc/ffmpeg    /usr/share/doc/ffmpeg/RELEASE_NOTES    /usr/share/doc/ffmpeg/copyright    /usr/share/ffmpeg    /usr/share/ffmpeg/libvpx-1080p.ffpreset    /usr/share/ffmpeg/libvpx-1080p50_60.ffpreset    /usr/share/ffmpeg/libvpx-360p.ffpreset    /usr/share/ffmpeg/libvpx-720p.ffpreset    /usr/share/ffmpeg/libvpx-720p50_60.ffpreset    /usr/share/lintian    /usr/share/lintian/overrides    /usr/share/lintian/overrides/ffmpeg    /usr/share/man    /usr/share/man/man1    /usr/share/man/man1/ffmpeg-all.1.gz    /usr/share/man/man1/ffmpeg-bitstream-filters.1.gz    /usr/share/man/man1/ffmpeg-codecs.1.gz    /usr/share/man/man1/ffmpeg-devices.1.gz    /usr/share/man/man1/ffmpeg-filters.1.gz    /usr/share/man/man1/ffmpeg-formats.1.gz    /usr/share/man/man1/ffmpeg-protocols.1.gz    /usr/share/man/man1/ffmpeg-resampler.1.gz    /usr/share/man/man1/ffmpeg-scaler.1.gz    /usr/share/man/man1/ffmpeg-utils.1.gz    /usr/share/man/man1/ffmpeg.1.gz    /usr/share/man/man1/ffplay-all.1.gz    /usr/share/man/man1/ffplay.1.gz    /usr/share/man/man1/ffprobe-all.1.gz    /usr/share/man/man1/ffprobe.1.gz    /usr/share/man/man1/ffserver-all.1.gz    /usr/share/man/man1/ffserver.1.gz    /usr/share/man/man1/qt-faststart.1.gz    /usr/share/doc/ffmpeg/changelog.Debian.gz    

...其中有用的部分是我添加到我的 PKG_CONFIG_PATH 中的“/usr/bin”，但在构建时仍然出现相同的错误。我正在运行 Ubuntu 18.04 LTS。我很茫然，在过去的两天里一直在努力解决这个问题，我们将 非常感谢任何帮助。谢谢，我很乐意提供更多需要的信息。作为一个小请求，我是 Linux 的新手，所以如果您能在命令行操作中包含尽可能多的详细信息，这将有助于 很多。

Answer 1

假设您在此处遵循 FFmpeg Ubuntu 编译指南:https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu

你要找的路径一定在这里:PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig