linux下通过ffmpeg实现音频拼接

1，下载安装MP3编码库

wget https://nchc.dl.sourceforge.net/project/lame/lame/3.100/lame-3.100.tar.gz
tar -zxvf lame-3.100.tar.gz -C /usr/local/
cd /usr/local/lame-3.100/
./configure --prefix=/usr/local/ --enable-shared
make
make install

2，下载安装ffmpeg

wget https://ffmpeg.org/releases/ffmpeg-4.1.tar.bz2
tar -jxvf ffmpeg-4.1.tar.bz2 -C /usr/local/
cd /usr/local/ffmpeg-4.1/
./configure --prefix=/usr/local/ffmpeg/ --enable-shared --enable-libmp3lame
make
make install

3，测试
/usr/local/ffmpeg/bin/ffmpeg

出现此内容表示安装成功

4，合并文件

/usr/local/ffmpeg/bin/ffmpeg -i 1.mp3 -i 2.mp3 -filter_complex '[0:0] [1:0] concat=n=2:v=0:a=1 [a]' -map [a] 3.mp3

5，问题及解决

问题1，测试的时候出现error whi