====== ffmpeg的安装和使用 ======
===== 官网 =====
[[https://ffmpeg.org/|https://ffmpeg.org/]]
===== 安装 =====
[[http://blog.csdn.net/u012891472/article/details/51482460|Ubuntu14.04安装编译ffmpeg]]

在安装ffmpeg之前，需要安装一堆软件，比如各种各样的转换器

<code>
wget http://ffmpeg.org/releases/ffmpeg-3.1.3.tar.bz2

tar xvjf  ffmpeg-3.1.3.tar.bz2 

cd ffmpeg-3.1.3

sudo ./configure --prefix=/usr/local/ffmpeg --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-pthreads --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libx264 --enable-libxvid --enable-x11grab --enable-libvorbis  

sudo make

sudo make install
</code>
===== 使用 =====
<code>
(1)从mp4转出mp3格式背景音乐
./ffmpeg -i /mnt/lost+found/FILES/RECORD_APP/movies/monster_hunter/st/st_3_cun.mp4 -vn 2.mp3

(2)从mp4截取出某个时间点的图片
./ffmpeg -i /mnt/lost+found/FILES/RECORD_APP/movies/monster_hunter/st/st_3_cun.mp4 -y -ss 00:00:09 -t 00:00:10 -s 320*240 -f mjpeg -vframes 10 test.jpg

(3)合并图片(一张或者多张)和mp3导出mp4
./ffmpeg -f image2 -i ./test.jpg -i ./2.mp3 -vcodec libx264 -r 1 ./2.mp4

(4)合并视频
1.把mp4转成api
./ffmpeg -i /mnt/lost+found/FILES/RECORD_APP/movies/monster_hunter/dt/dt_11_xl1.mp4 dt_11_xl1.avi
./ffmpeg -i /mnt/lost+found/FILES/RECORD_APP/movies/monster_hunter/dt/dt_8_sm2.mp4 dt_8_sm2.avi
2.合并avi
./ffmpeg -i concat:"dt_11_xl1.avi|dt_8_sm2.avi" -vcodec copy -acodec copy ./合并.avi
3.把avi转成mp4
./ffmpeg -i ./合并.avi ./合并.mp4
</code>