视频加水印
ffmpeg -i 094301010916b3019b0174515.mp4 -vf "movie=logo1.png [logo]; [in][logo] overlay=0:0 [out]" 13.mp4
视频合并
ffmpeg -i concat:"2122180309164d675fa82952.mp4|single_jpg.mp4" -c copy oo.mp4
图片转视频
ffmpeg -f image2 -stream_loop 100 -i vv5851.jpg -b:v 200k -r 10 -s 640x480 -acodec libfaac -y single_jpg.mp4
wget http://ffmpeg.org/releases/ffmpeg-3.1.3.tar.bz2
tar jxvf ffmpeg-3.1.3.tar.bz2
cd ffmpeg-3.1.3
./configure --prefix=/usr --disable-yasm --enable-libx264 --enable-gpl
make
make install
--enable-libmp3lame --enable-libvorbis --enable-gpl --enable-version3 --enable-nonfree --enable-pthreads --enable-libfaac --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-libxvid --enable-postproc --enable-ffserver --enable-ffplay
#以下脚本保存成.sh文件运行，不会出现中文乱码问题 网上查到用enable关键字控制，实际是draw
#加水印 水印位置由x,y,w,h来控制
#ffmpeg编译时需--enable-libfreetype才能用此功能
#!/bin/bash
ffmpeg -y -i jiushu.mpg -acodec libfaac -b:a 30k -ar 44100 -r 15 -ac 2 -s 480x272 -vcodec libx264 -refs 2 -x264opts keyint=150:min-keyint=15 -vprofile baseline -level 20 -b:v 200k -vf "drawtext=fontfile=/mnt/hgfs/zm/simhei.ttf: text=‘来源：迅雷‘:x=100:y=x/dar:fontsize=24:fontcolor=yellow@0.5:shadowy=2" drawtext.mp4
#加水印，显示10秒
#!/bin/bash
ffmpeg -y -i jiushu.mpg -acodec libfaac -b:a 30k -ar 44100 -r 15 -ac 2 -s 480x272 -vcodec libx264 -refs 2 -x264opts keyint=150:min-keyint=15 -vprofile baseline -level 20 -b:v 200k -vf "drawtext=fontfile=/mnt/hgfs/zm/simhei.ttf: text=‘来源：迅雷‘:x=100:y=x/dar:draw=‘if(gt(n,0),lt(n,250))‘:fontsize=24:fontcolor=yellow@0.5:shadowy=2" drawtext.mp4
#加水印，每3秒显示1秒
#!/bin/bash
ffmpeg -y -i jiushu.mpg -acodec libfaac -b:a 30k -ar 44100 -r 15 -ac 2 -s 480x272 -vcodec libx264 -refs 2 -x264opts keyint=150:min-keyint=15 -vprofile baseline -level 20 -b:v 200k -vf "drawtext=fontfile=/mnt/hgfs/zm/simhei.ttf: text=‘来源：迅雷‘:x=w-100:y=100:draw=lt(mod(t\,3)\,1):fontsize=24:fontcolor=yellow@0.5:shadowy=2" drawtext.mp4
http://suncom.diandian.com/post/2013-09-12/40053016139
ffmpeg -y -i 007.mp4 -acodec libfaac -b:a 30k -ar 44100 -r 15 -ac 2 -s 480x272 -vcodec libx264 -refs 2 -x264opts keyint=150:min-keyint=15 -vprofile baseline -level 20 -b:v 200k -vf "drawtext=fontfile=/root/ffmpeg/simhei.ttf: text='vv5851':x=w-100:y=100:draw=lt(mod(t\,3)\,1):fontsize=24:fontcolor=yellow@0.5:shadowy=2" n007.mp4
--enable-libx264
ftp://ftp.videolan.org/pub/x264/snapshots/last_x264.tar.bz2
./configure --enable-shared --disable-asm && make && make install
编译FAAC-1.28时遇到错误：
mpeg4ip.h:126: error: new declaration ‘char* strcasestr(const char*, const char*)’
解决方法：
从123行开始修改此文件mpeg4ip.h，到129行结束。
修改前：
#ifdef __cplusplus
extern "C" {
#endif
char *strcasestr(const char *haystack, const char *needle);
#ifdef __cplusplus
}
#endif
修改后：
#ifdef __cplusplus
extern "C++" {
#endif
const char *strcasestr(const char *haystack, const char *needle);
#ifdef __cplusplus
}
#endif
