1. 安装yasm
wget http://www.tortall.net/projects/yasm/releases/yasm-1.1.0.tar.gz ./configure make make install
2.编译FFmpeg支持movie 和avfilter
svn co svn://svn.ffmpeg.org/soc/libavfilter cd libavfilter ./checkout.sh cd ffmpeg ./configure --enable-filter=movie --enable-avfilter make && make install
增加水印
简单使用 ffmpeg -i in.flv -vf "movie=0:png:logo.png [wm];[in][wm] overlay=250:10:1 [out]" out.flv 增强画质 ffmpeg -i in.flv -vcodec libx264 -qmin 10 -qmax 51 -qdiff 4 -me_range 16 -keyint_min 25 -qcomp 0.6 -b 1500K -vf "movie=0:png:logo.png [wm];[in][wm] overlay=250:10:1 [out]" out.flv 如果开启了x264可使用 ffmpeg -i in.flv -qmin 10 -qmax 51 -qdiff 4 -me_range 16 -keyint_min 25 -qcomp 0.6 -b 1500K -vf "movie=0:png:logo.png [wm];[in][wm] overlay=250:10:1 [out]" out.flv 上面其中overlay的值250和10分别代表水印的横纵坐标
参考：
http://ffmpeg.arrozcru.org/forum/viewtopic.php?f=8&t=1400
http://blog.linuxphp.org/archives/1388/