起因：youtube-dl合并音视频的时候提示如下错误 WARNING: Your copy of avconv is outdated, update avconv to version 10-0 or newer if you encounter any errors. 故：升级avconv 1.) Make a directory avconv-source mkdir avconv-source 2.) Download and install the x264 library cd ~/avconv-source git clone git://git.videolan.org/x264.git x264 cd x264 sudo ./configure --enable-static sudo make sudo make install 3.) Download the avconv source cd ~/avconv-source git clone git://git.libav.org/libav.git avcon……