ffmpeg filter 参数及效果
ffmpeg 滤镜基本使用方法
ffplay -vf filter_name=filter_params:filter_params:...
在Windows系统ffmpeg使用frei0r时需要加环境变量 FREI0R_PATH=frei0r安装目录
单击图片复制滤镜命令
ffmpeg filter使用参考 http://ffmpeg.org/ffmpeg-filters.html
sendcmd 参考 http://ffmpeg.org/ffmpeg-filters.html#sendcmd_002c-asendcmd
frei0r 参考 http://www.cnblogs.com/nlsoft/archive/2013/05/07/3065311.html
![原图](https://images.cnblogs.com/cnblogs_com/nlsoft/478267/o__Sample.gif)
![-vf boxblur=luma_radius=min(h\,w)/10:luma_power=1:chroma_radius=min(cw\,ch)/10:chroma_power=1](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_boxblur.gif)
![-vf colorbalance=rs=0.75](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_colorbalance.gif)
![-vf colorchannelmixer=.3:.4:.3:0:.3:.4:.3:0:.3:.4:.3](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_colorchannelmixer.gif)
![-vf crop=2/3*in_w:2/3*in_h](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_crop.gif)
![-vf delogo=x=300:y=100:w=100:h=77:band=10](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_delogo.gif)
![-vf drawbox=x=10:y=20:w=200:h=60:color=red@0.5](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_drawbox_1.gif)
![-vf drawbox=x=300:y=100:w=100:h=100:color=pink@0.5:t=max](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_drawbox_2.gif)
![-vf drawtext='fontfile=_ht.ttf:x=100:y=50:fontsize=48:fontcolor=#FFFFFF:box=1:boxcolor=red@0.2:shadowcolor=#303030:shadowx=2:shadowy=2:text=DRAWTEXT'](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_drawtext.gif)
![-vf edgedetect=low=0.1:high=0.6](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_edgedetect.gif)
![-vf fade=in:0:30](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_fade.gif)
![-vf framestep=8](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_framestep.gif)
![-vf hflip](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_hflip.gif)
![-vf hqdn3d=20](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_hqdn3d.gif)
![-vf hue='s=min(t/2\,1)'](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_hue_1.gif)
![-vf hue='h=60:s=-3'](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_hue_2.gif)
![-vf lutrgb='r=negval:g=negval:b=negval'](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_lutrgb_1.gif)
![-vf lutrgb='g=0:b=0'](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_lutrgb_2.gif)
![-vf lutyuv=y=negval](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_lutyuv_1.gif)
![-vf lutyuv='u=128:v=128'](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_lutyuv_2.gif)
![-vf mp=eq2=1.0:2:0.5](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_mp.gif)
![-vf noise=alls=20:allf=t+u](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_noise.gif)
![-vf pad='3/2*iw:3/2*ih:(ow-iw)/2:(oh-ih)/2'](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_pad.gif)
![-vf setpts=2.0*PTS](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_setpts_1.gif)
![-vf setpts=0.5*PTS](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_setpts_2.gif)
![-vf stereo3d=sbsl:aybd](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_stereo3d_1.gif)
![-vf stereo3d=abl:sbsr](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_stereo3d_2.gif)
![-vf thumbnail=8](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_thumbnail.gif)
![-vf tile=3x2:nb_frames=5:padding=7:margin=2](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_tile.gif)
![-vf transpose=1:portrait](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_transpose.gif)
![-vf unsharp=7:7:-2:7:7:-2](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_unsharp.gif)
![-vf vflip](https://images.cnblogs.com/cnblogs_com/nlsoft/478408/o_vflip.gif)