Ffmpeg 命令通过循环向视频添加更短的音频

Question

Ffmpeg 命令通过循环向视频添加更短的音频

我正在使用此命令向视频添加音频，音频长 18 秒，视频长 3 分 29 秒，此命令添加音频但仅在前 18 秒，然后停止

"-y","-stream_loop","-1","-i", audio,"-i",j, "-filter_complex",
                        "[0:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=0.5[a1];" +
                        "[1:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=0.8[a2];" +
                        " [a1][a2]amerge,pan=stereo:c0<c0+c2:c1<c1+c3[out]",
                        "-map","1:v","-map","[out]","-c:v","copy","-c:a","aac","-shortest","-preset", "ultrafast", out

我们如何在循环中添加音频并将其添加到视频中

编辑

对于时间问题，我做了以下更改

"-y","-i",video,"-filter_complex","amovie="+audio+":loop=999,asetpts=N/SR/TB,aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=0.5[a1];" +[0:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=0.8[a2];" +"[a1][a2]amerge,pan=stereo:c0<c0+c2:c1<c1+c3[out]",
"-t", timetoedit,
"-map","0:v","-map","[out]","-c:v","copy","-c:a","aac","-shortest","-preset", "ultrafast", out 

如果我们想在整个视频中添加音频，这很好用

现在，当我们尝试添加在特定时间开始并持续特定持续时间的音频时，它会失败
这里有两件事，
1) 创建一个包含特定持续时间的音频和视频的新剪辑
此命令不起作用

"-y","-i",video,,"ss",starttime,"-t", timetoedit,"-filter_complex","amovie="+audio+":loop=999,asetpts=N/SR/TB,aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=0.5[a1];" +[0:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=0.8[a2];" +"[a1][a2]amerge,pan=stereo:c0<c0+c2:c1<c1+c3[out]",
"-ss", starttime,"-t", timetoedit,
"-map","0:v","-map","[out]","-c:v","copy","-c:a","aac","-shortest","-preset", "ultrafast", out 

或者如果我们只想在特定时间添加音频

喜欢

"-y","-i",video,"-filter_complex","amovie="+audio+":loop=999,asetpts=N/SR/TB,aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=0.5[a1];" +[0:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=0.8[a2];" +"[a1][a2]amerge,pan=stereo:c0<c0+c2:c1<c1+c3[out]",
    "-ss", starttime,"-t", timetoedit,
    "-map","0:v","-map","[out]","-c:v","copy","-c:a","aac","-shortest","-preset", "ultrafast", out 

如何才能做到这一点

这很有用
https://superuser.com/questions/708125/add-audio-at-specific-time-in-video-using-ffmpeg

但是我们如何在特定的开始时间和持续时间使用它

Answer 1

利用

"-y","-i",j, "-filter_complex",
                        "amovie=audio:loop=999,asetpts=N/SR/TB,aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=0.5[a1];" +
                        "[0:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=0.8[a2];" +
                        " [a1][a2]amerge,pan=stereo:c0<c0+c2:c1<c1+c3[out]",
                        "-map","0:v","-map","[out]","-c:v","copy","-c:a","aac","-shortest","-preset", "ultrafast", out

-stream_loop是 buggy 。请改用具有循环选项的电影过滤器。