Linux编译simplest_ffmpeg

（一）环境及所需文件

1. Ubuntu 16.04 (gcc/g++ 7.1)

2. FFmpeg-2.8.15 (http://ffmpeg.org/download.html#releases)

3. SDL-2.0.10 (http://www.libsdl.org/download-2.0.php)

4. simplest_ffmpeg_player (https://github.com/leixiaohua1020/simplest_ffmpeg_player)

（二）配置、安装FFmpeg和SDL

1. 解压 FFmpeg 的压缩包（如 ffmpeg-2.8.15.tar.gz）到当前目录，然后通过终端进入该目录，并编译、安装：

cd ./ffmpeg-2.8.15
./configure --disable-yasm #此处选项为yasm报错
make
sudo make install

2. 解压 SDL 的压缩包（如 SDL2-2.0.10.tar.gz）到当前目录，然后通过终端进入该目录，并编译、安装：

cd ./SDL2-2.0.10
./configure
make
sudo make install

（三）编译simplest_ffmpeg_player

解压simplest_ffmpeg_player的压缩包（如 simplest_ffmpeg_player_2.5.zip），然后通过终端进入子目录simplest_ffmpeg_player，并编译：

cd ./simplest_ffmpeg_player_2.5
cd ./simplest_ffmpeg_player
g++ simplest_ffmpeg_player.cpp -g -o simplest_ffmpeg_player.out -I /usr/local/include/ -L /usr/local/lib -lSDL2main -lSDL2 - lavcodec -lavutil -lswscale -pthread -lz -lm -lbz2 -lswresample

因环境配置原因，原本的simplest_ffmpeg_player中的gcc编译命令（complile_gcc.sh）

#! /bin/sh
gcc simplest_ffmpeg_player.cpp -g -o simplest_ffmpeg_player.out \
-I /usr/local/include -L /usr/local/lib -lSDL2main -lSDL2 -lavformat -lavcodec -lavutil -lswscale

会报错。

具体报错如下形式：

1. 缺少 -pthread：

/usr/bin/ld: /usr/local/lib/libavformat.a(udp.o): undefined reference to symbol 'pthread_cancel@@GLIBC_2.2.5'
//lib/x86_64-linux-gnu/libpthread.so.0: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status

2. 缺少 -lz：

/home/ecc/Documents/ffmpeg/ffmpeg-2.8.15/libavformat/rtmpproto.c:1077: undefined reference to `inflateInit_'
/home/ecc/Documents/ffmpeg/ffmpeg-2.8.15/libavformat/rtmpproto.c:1087: undefined reference to `inflate'
/home/ecc/Documents/ffmpeg/ffmpeg-2.8.15/libavformat/rtmpproto.c:1105: undefined reference to `inflateEnd'
/home/ecc/Documents/ffmpeg/ffmpeg-2.8.15/libavformat/rtmpproto.c:1105: undefined reference to `inflateEnd'

3. 缺少 -lbz2：

/home/ecc/Documents/ffmpeg/ffmpeg-2.8.15/libavformat/matroskadec.c:1325: undefined reference to `BZ2_bzDecompressInit'
/home/ecc/Documents/ffmpeg/ffmpeg-2.8.15/libavformat/matroskadec.c:1340: undefined reference to `BZ2_bzDecompress'
/home/ecc/Documents/ffmpeg/ffmpeg-2.8.15/libavformat/matroskadec.c:1333: undefined reference to `BZ2_bzDecompressEnd'
/home/ecc/Documents/ffmpeg/ffmpeg-2.8.15/libavformat/matroskadec.c:1343: undefined reference to `BZ2_bzDecompressEnd'

4. 缺少 -lswresample：

/usr/local/lib/libavcodec.a(opusdec.o): In function `opus_decode_subpacket':
/home/ecc/Documents/ffmpeg/ffmpeg-2.8.15/libavcodec/opusdec.c:379: undefined reference to `swr_is_initialized'
/usr/local/lib/libavcodec.a(opusdec.o): In function `opus_decode_frame':
/home/ecc/Documents/ffmpeg/ffmpeg-2.8.15/libavcodec/opusdec.c:220: undefined reference to `swr_is_initialized'
/usr/local/lib/libavcodec.a(opusdec.o): In function `opus_init_resample':
/home/ecc/Documents/ffmpeg/ffmpeg-2.8.15/libavcodec/opusdec.c:161: undefined reference to `swr_init'
/home/ecc/Documents/ffmpeg/ffmpeg-2.8.15/libavcodec/opusdec.c:167: undefined reference to `swr_convert'
/usr/local/lib/libavcodec.a(opusdec.o): In function `opus_decode_frame':
/home/ecc/Documents/ffmpeg/ffmpeg-2.8.15/libavcodec/opusdec.c:234: undefined reference to `swr_convert'
/usr/local/lib/libavcodec.a(opusdec.o): In function `opus_flush_resample':
/home/ecc/Documents/ffmpeg/ffmpeg-2.8.15/libavcodec/opusdec.c:115: undefined reference to `swr_convert'
/usr/local/lib/libavcodec.a(opusdec.o): In function `opus_decode_subpacket':
/home/ecc/Documents/ffmpeg/ffmpeg-2.8.15/libavcodec/opusdec.c:411: undefined reference to `swr_close'
/usr/local/lib/libavcodec.a(opusdec.o): In function `opus_decode_flush':
/home/ecc/Documents/ffmpeg/ffmpeg-2.8.15/libavcodec/opusdec.c:614: undefined reference to `swr_close'
/usr/local/lib/libavcodec.a(opusdec.o): In function `opus_decode_close':
/home/ecc/Documents/ffmpeg/ffmpeg-2.8.15/libavcodec/opusdec.c:638: undefined reference to `swr_free'
/usr/local/lib/libavcodec.a(opusdec.o): In function `opus_decode_init':
/home/ecc/Documents/ffmpeg/ffmpeg-2.8.15/libavcodec/opusdec.c:705: undefined reference to `swr_alloc'

参考

https://blog.csdn.net/leixiaohua1020/article/details/38868499