linux 编译 ffmpeg
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下载源码
下载ffmpeg源码 或者通过git clone源码：git clone git@github.com:FFmpeg/FFmpeg.git -
进入源码根目录，执行
./configure出现如下错误：nasm/yasm not found需要下载yasm汇编器
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下载yasm汇编器
wget https://www.tortall.net/projects/yasm/releases/yasm-1.3.0.tar.gz解压安装 :
tar -zxvf yasm-1.3.0.tar.gz进入解压后目录
cd yasm-1.3.0 ./configure # 接着 make sudo make install接着返回 ffmpeg目录，执行命令
small@small:~/FFmpeg$ ./configure --prefix="/usr/local/ffmpeg/" --enable-libx264 --enable-gpl --enable-nonfree --enable-libfdk-aac出现如下显示就代表成功了：
small@small:~/FFmpeg$ ./configure install prefix /usr/local source path . C compiler gcc C library glibc ARCH x86 (generic) big-endian no runtime cpu detection yes standalone assembly yes x86 assembler yasm MMX enabled yes MMXEXT enabled yes 3DNow! enabled yes 3DNow! extended enabled yes SSE enabled yes SSSE3 enabled yes AESNI enabled yes AVX enabled yes AVX2 enabled yes AVX-512 enabled yes XOP enabled yes ...
启用第三方模块支持：libfdk_aac和libx264，需要单独下载编译
出现如下错误
1. ERROR: libfdk_aac not found
small@small:~/FFmpeg$ ./configure --enable-libx264 --enable-libfdk-aac --enable-gpl --enable-nonfree
ERROR: libfdk_aac 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
ffmpeg-user@ffmpeg.org 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.
下载libfdk_aac库：
https://sourceforge.net/projects/opencore-amr/files/fdk-aac/
./configure # 配置
make # 编译
make install # 编译安装
2. ERROR: libx264 not found
small@small:~/FFmpeg$ ./configure --enable-libx264 --enable-libfdk-aac --
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
ffmpeg-user@ffmpeg.org 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.
下载libx264 ：https://www.videolan.org/developers/x264.html
代码库：git clone https://code.videolan.org/videolan/x264.git
下载完继续：
./configure --enable-shared
make
make install
3. 还没完，又出现新的错误了：
small@small:~/x264$ ./configure
Found no assembler
Minimum version is nasm-2.13
If you really want to compile without asm, configure with --disable-asm.
下载nasm目前最新版 :https://www.nasm.us/pub/nasm/releasebuilds/2.15/
继续编译安装：
./configure
make
make install
4. 回到上一步，继续编译x264:
./configure --enable-shared # --enable-shared 这里很重要
make
make install
5. 最终回到ffmpeg继续编译:
small@small:~/FFmpeg$ ./configure --enable-libx264 --enable-libfdk-aac --
small@small:~/FFmpeg$ make
small@small:~/FFmpeg$ make install
6. make: Nothing to be done for 'all'.
有时候需要重新编译，会遇到这个错误，需要 clean
make clean
7. 最后还有个问题就是找不到.so 库的问题
small@small:/usr/lib$ ffmpeg
ffmpeg: error while loading shared libraries: libx264.so.161: cannot open shared object file: No such file or directory
这个问题一看就是没找到动态库，libx264默认安装路径是 /usr/local/lib 目录，解决这个问题的方法就是建个软连接或者直接把库移动到 /usr/lib 目录:
small@small:/usr/local/lib$ sudo ln -s /usr/local/lib/libx264.so.161 /usr/lib/libx264.so.161
大功告成，没有报错；
8. 接下来试试看是否正常：
small@small:~$ ffmpeg -i YOLOv3.mp4 YO.flv
ffmpeg version 4.3.git Copyright (c) 2000-2021 the FFmpeg developers
built with gcc 9 (Ubuntu 9.3.0-17ubuntu1~20.04)
configuration: --enable-libx264 --enable-libfdk-aac --enable-gpl --enable-nonfree
libavutil 56. 66.100 / 56. 66.100
libavcodec 58.125.101 / 58.125.101
libavformat 58. 68.100 / 58. 68.100
libavdevice 58. 12.100 / 58. 12.100
libavfilter 7.107.100 / 7.107.100
libswscale 5. 8.100 / 5. 8.100
libswresample 3. 8.100 / 3. 8.100
libpostproc 55. 8.100 / 55. 8.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'YOLOv3.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
creation_time : 2018-10-29T06:43:27.000000Z
Duration: 00:03:45.70, start: 0.000000, bitrate: 2072 kb/s
Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720 [SAR 1:1 DAR 16:9], 1942 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc (default)
...
9. 看一下转换结果，没有问题~
small@small:~$ ls
FFmpeg fdk-aac-2.0.1 log.txt nasm-2.15.tar.gz x264
YO.flv fdk-aac-2.0.1.tar.gz nasm-2.13.03.tar.gz python
YOLOv3.mp4 go nasm-2.15 test.go yasm-1.3.0.tar.gz
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