系统环境：Ubuntu 12.04
一、今天想将acc转换为mp3格式，执行该命令：
ffmpeg -i 町は賑やかに.aac -acodec libmp3lame -ab 192k 町は賑やかに.mp3提示错误“Unknown encoder 'libmp3lame'”。后来安装以下解决：
sudo apt-get install libavcodec-extra-53
如果需要，可以直接安装附加受限软件，一次性解决一些问题。这些软件包括：cabextract ffmpeg flashplugin-installer gstreamer0.10-plugins-bad-multiverse libavcodec-extra-53 libavutil-extra-51 libfaac0 libmjpegtools-1.9 libnspr4-0d libopenjpeg2 libquicktime2 ttf-mscorefonts-installer ubuntu-restricted-addons ubuntu-restricted-extras unrar。命令如下：
sudo apt-get install ubuntu-restricted-extras
二、常见音频转换
:wav to mp3ffmpeg -i audio.wav -acodec libmp3lame audio.mp3:wav to oggffmpeg -i audio.wav -acodec libvorbis audio.ogg:wav to aacffmpeg -i audio.wav -acodec libfaac audio.aac:wav to ac3ffmpeg -i audio.wav -acodec ac3 audio.mp3:ogg to mp3ffmpeg -i audio.ogg -acodec libmp3lame audio.mp3:ogg to wavffmpeg -i audio.ogg audio.wav:ogg to aacffmpeg -i audio.ogg -acodec libfaac audio.aac:ogg to ac3ffmpeg -i audio.ogg -acodec ac3 audio.ac3:ac3 to mp3ffmpeg -i audio.ac3 -acodec libmp3lame audio.mp3:ac3 to wavffmpeg -i audio.ac3 audio.wav:ac3 to aacffmpeg -i audio.ac3 -acodec libfaac audio.aac:ac3 to oggffmpeg -i audio.ac3 -acodec libvorbis audio.ogg:aac to mp3ffmpeg -i audio.aac -acodec libmp3lame audio.mp3:aac to wavffmpeg -i audio.aac audio.wav:aac to ac3ffmpeg -i audio.aac -acodec ac3 audio.ac3:aac to oggffmpeg -i audio.aac -libvorbis audio.ogg