FFMpeg 流说明符不匹配

Question

我试图将 2 到 n 个具有各种过渡的视频与来自它们上方的 mp3 音频结合起来(最后一秒已褪色)。

ffmpeg -ss 5 -t 10 -i C:\Users\User\source\repos\tryRunFFmpeg\2_snow.mp4  
       -ss 5 -t 10 -i C:\Users\User\source\repos\tryRunFFmpeg\3_sun.mp4 
       -i C:\Users\User\source\repos\tryRunFFmpeg\outaudio.mp3
-filter_complex "[0:v]setpts =PTS-STARTPTS[va0];[1:V]fade=t=in:st=0:d=0.5:alpha=1,fade=t=out:st=9.5:d=0.5,setpts=PTS-STARTPTS+10/TB[va1];[2:a]fade=t=out:st=9.5:d=0.5[aa];[va0][va1]overlay[outv]"
 -map aa -c:a copy  -map [outv] -crf 10 -b:V 10M -shortest C:\Users\User\source\repos\tryRunFFmpeg\testAgaint.mp4

我得到这个错误

Stream specifier ':a' in filtergraph description [0:v]setpts =PTS-STARTPTS[va0];[1:V]fade=t=in:st=0:d=0.5:alpha=1,fade=t=out:st=9.5:d=0.5,setpts=PTS-STARTPTS+10/TB[va1];[2:a]fade=t=out:st=9.5:d=0.5[aa];[va0][va1]overlay[outv] matches no streams.

Answer 1

您的命令有几个小问题:

Stream specifier ':a' in filtergraph description ... matches no streams.

更改 [2:a]fade至 [2:a]afade .淡入淡出滤镜用于视频。淡入淡出过滤器用于音频。

Filter afade has an unconnected output

更改 -map aa至 -map [aa] .

Streamcopy requested for output stream 0:0, which is fed from a complex filtergraph. Filtering and streamcopy cannot be used together.

删除 -c:a copy .