Ubuntu14.04安装编译ffmpeg

(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