FFMPEG集成x264
1.x264下載地址：
http://download.videolan.org/pub/videolan/x264/snapshots/
2. FFMPEG引入外部庫x264方法
https://www.cnblogs.com/wanggang123/p/8660435.html
FFMPEG引入x264時出現的問題
FFMPEG引入外部x264在./configure時出現以下問題：
gcc -L./x264 -Wl,–as-needed -o /tmp/ffconf.ZNG31130 /tmp/ffconf.xCt31136.o -lx264 -lm -lbz2 -lz -pthread -lrt
./x264/libx264.a(opencl.o): In function x264_opencl_close_library': opencl.c:(.text+0x572): undefined reference todlclose’
./x264/libx264.a(opencl.o): In function x264_opencl_load_library': opencl.c:(.text+0x5d7): undefined reference todlopen’
opencl.c:(.text+0x5f1): undefined reference to dlsym' opencl.c:(.text+0x60e): undefined reference todlsym’
opencl.c:(.text+0x62b): undefined reference to dlsym' opencl.c:(.text+0x648): undefined reference todlsym’
opencl.c:(.text+0x665): undefined reference to dlsym' ./x264/libx264.a(opencl.o):opencl.c:(.text+0x682): more undefined references todlsym’ follow
./x264/libx264.a(opencl.o): In function x264_opencl_load_library': opencl.c:(.text+0x8fd): undefined reference todlclose’
./x264/libx264.a(opencl.o): In function x264_opencl_lookahead_init': opencl.c:(.text+0x1841): undefined reference todlopen’
opencl.c:(.text+0x185b): undefined reference to dlsym' opencl.c:(.text+0x186d): undefined reference todlsym’
opencl.c:(.text+0x1881): undefined reference to dlsym' opencl.c:(.text+0x1895): undefined reference todlsym’
opencl.c:(.text+0x18d4): undefined reference to `dlclose’
collect2: ld returned 1 exit status
解決方法
在GUI配置相應項或makefile裏面的gcc命令行中添加-ldl，如：
../configure --enable-static --enable-libx264 --enable-gpl --disable-x86asm --prefix=/home/wgg/compile/ffmpeg/static --extra-cflags="-I/home/wgg/work/compile/x264/static/include" --extra-ldflags="-L/home/wgg/work/compile/x264/static/lib -ldl"
參考網址：https://bbs.csdn.net/topics/390842477