ffmpeg: Audio/Video 淡入淡出 in/out

ffmpeg: Audio/Video Fade in/out

我有这个带音频衰减的工作脚本。我怎样才能输入和输出视频的淡入淡出。它总是给我一个错误:

"Option filter:v (set stream filtergraph) cannot be applied to input url ./mp3/conv/1.m4a -- you are trying to apply an input option to an output file or vice versa. Move this option before the file it belongs to."

这适用于音频衰减:

 ffmpeg  -ss 00:00:00 -t 90 -i "concat:intermediate0.ts|concat:intermediate1.ts"  
-i "./mp3/conv/1.m4a" -af "afade=t=out:st=84:d=6"  -map 0:v:0 -map 1:a:0 
video/out515.mp4 -y

这不适用于音频+视频淡入淡出:

ffmpeg  -ss 00:00:00 -t 90-i  "concat:intermediate0.ts|intermediate1.ts" 
-filter:v 'fade=in:0:30,fade=out:250:30' -i "./mp3/conv/1.m4a" 
-af "afade=t=out:st=84:d=6" -map 0:v:0 -map 1:a:0  video/out515.mp4 -y

视频过滤器是输出选项,因此,在所有输入之后:

ffmpeg  -ss 00:00:00 -t 90-i  "concat:intermediate0.ts|intermediate1.ts" -i "./mp3/conv/1.m4a" 
        -af "afade=t=out:st=84:d=6" -vf 'fade=in:0:30,fade=out:250:30'
        -map 0:v:0 -map 1:a:0  video/out515.mp4 -y

这是有效的最终结果

ffmpeg -ss 00:00:00 -t 90 -i "concat:intermediate0.ts" 
-ss 00:00:00 -t 90 -i ".\mp3\conv.m4a" -af "afade=t=out:st=84:d=6" 
-vf "fade=in:0:25,fade=out:2225:25" -map 0:v:0 -map 1:a:0 video/out515.mp4 -y