用ffmpeg对视频添加语音、背景音乐和字幕的方法

先看代码：

ffmpeg.exe ^
-i "D:/test/video.mp4" ^
-i "D:/test/voice.mp3" ^
-i "D:/test/music.mp3" ^
-i "D:/test/voice.srt" ^
-filter_complex "[1:a]volume=1.0,asetpts=PTS-STARTPTS[a_voice];[2:a]volume=0.5,asetpts=PTS-STARTPTS[a_music];[a_voice][a_music]amix=inputs=2:duration=first[audio_mixed];[0:v]subtitles='D\:/test/voice.srt':force_style='Fontsize=24,Fontcolor=white'[vout]" ^
-map "[vout]" ^
-map "[au