android - 如何制作淡入淡出视频？

Question

此命令用于创建淡入和淡出：

https://androidlearnersite.wordpress.com/2017/03/17/ffmpeg-video-editor/comment-page-1/#comment-150

 String[] command = {"-y", "-i", file.getAbsolutePath(), "-acodec", "copy", 
 "-vf", "fade=t=in:st=0:d=5,fade=t=out:st=" + 
 String.valueOf((Share.size_of_images * 3sec) - 5) + ":d=5", 
 file1.getAbsolutePath()};

 video path = file.getAbsolutePath() 
 output path = file2.getAbsolutepath()

厌倦了创造这个。请帮我。