linux下ffmpeg安装时ERROR: libx264 not found 错误解决

一、下图是产生错误的，命令：

[root@CentOS7 ffmpeg]# ./configure --prefix=/usr/ffmpeg --enable-shared --enable-yasm --enable-libx264 --enable-gpl --extra-cflags=-l/usr/x264/include --extra-ldflags=-L/usr/x264/lib

报出的错误：

ERROR: libx264 not found

If you think configure made a mistake, make sure you are using the latest
version from Git.  If the latest version fails, report the problem to the
[email protected] mailing list or IRC #ffmpeg on irc.freenode.net.
Include the log file "ffbuild/config.log" produced by configure as this will help
solve the problem.

根据提示去查看错误的日志，日志存放的地址如上已经指出ffbuild/config.log。
二、查看具体的错误信息：
如图：

check_pkg_config libx264 x264 stdint.h x264.h x264_encoder_encode
test_pkg_config libx264 x264 stdint.h x264.h x264_encoder_encode
pkg-config --exists --print-errors x264
Package x264 was not found in the pkg-config search path.
Perhaps you should add the directory containing `x264.pc'
to the PKG_CONFIG_PATH environment variable
No package 'x264' found

以上告诉你没有找到pkg-config这个文件夹，所以也就不存在x264.pc这个命令。
接下来我们看一下为什么找不到这个文件夹，明明参数–extra-ldflags=-L/usr/x264/lib都指定了，到x264下看看；

发现安装x264的pkgconfig不叫pkg-config，由于不知道什么原因也不敢乱改怕有不可知的影响，仔细读报错发现一个变量名PKG_CONFIG_PATH，这就好办了，编辑/etc/profile这个文件添加这个变量：

export PKG_CONFIG_PATH=$X264_HOME/lib/pkgconfig

然后保存，执行

source /etc/profile

再次切换到ffmpeg下执行./configure…那些命令，发现好了！