Question

Ffmpeg命令将更短的音频添加到带循环的视频

我正在使用此命令将音频添加到视频中，音频长达18秒，视频长度为3分29秒，此命令会添加音频但仅在前18秒内停止

"-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

修改

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

如果我们想要为整个视频添加音频

，这很有效

现在，当我们尝试添加在特定时间开始并在特定时间内启动的音频时，它会失败这里有两件事， 1）创建一个具有特定持续时间的音频和视频的新剪辑这个命令不起作用

"-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

或者我们是否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

怎么做呢

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

但我们如何在特定的开始时间和持续时间内使用它

Answer 1

使用

"-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是错误的。请改用电影过滤器，它有一个循环选项。

Answer 2

使用代码

./ffmpeg -i long.mp3 -filter_complex "amovie=background_music.mp3:loop=999[s];[0][s]amix=duration=shortest" test.mp3

Ffmpeg命令通过循环向视频添加较短的音频

2 个答案: