1. 已安装libfdk_acc库. 按照步骤如下:
   wget https://downloads.sourceforge.net/opencore-amr/fdk-aac-2.0.1.tar.gz
   tar -xf fdk-aac-2.0.1.tar.gz
   ./autogen.sh
   ./configure --prefix=/usr/local/dk-aac-2.0.1 --enable-shared
   make
   sudo make install
2. 已添加/usr/local/fdk-aac-2.0.1/lib/pkgconfig到PKG_CONIFG_PATH
3. ~/.bashrc:
4. 
5. 执行pkg-config --libs --cflags fdk-aac的结果:
6. 
7. 重新编译ffmpeg: ./configure --prefix=/usr/local/ffmpeg --enable-debug=3 --disable-x86asm --enable-sdl2 --enable-shared --enable-libfdk-aac
8. 配置完后, fdk_aac是使能的:
9. 

最后执行命令:ffmpeg -i ../../data/911Mothers_2010W-light.mp4 -vn -c:a libfdk_aac -ar 44100 -channels 2 -profile:a aac_low aac_lc.aac
还是报错(sudo apt install libfdk-aac-dev也试过了):

我换了一个编码器是可以的:ffmpeg -i ../../data/911Mothers_2010W-light.mp4 -vn -c:a aac -ar 44100 -channels 2 -profile:a aac_low aac_lc.aac
老师帮帮忙!!!