FFmpeg 为视频添加背景音频,但不会完全静音原始音频

FFmpeg 为视频添加背景音频,但不会完全静音原始音频

正在合并,但我不想删除视频的原始音频。我想将音频叠加在背景中。

有没有办法实现这种行为?我正在使用此命令将音频合并到视频中:

$ ffmpeg -i adele.mp3 -i Ruby\ on\ Rails\ 101-\ What\ is\ Ruby\ on\ Rails_.mp4 -c:v libx264 -c copy -aspect 16:9 -r 30 test.mp4
ffmpeg version N-60332-ga0d5204 Copyright (c) 2000-2014 the FFmpeg developers
  built on Feb  4 2014 21:31:51 with Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn)
  configuration: --prefix=/usr/local --enable-gpl --enable-nonfree --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid
  libavutil      52. 63.100 / 52. 63.100
  libavcodec     55. 49.101 / 55. 49.101
  libavformat    55. 29.101 / 55. 29.101
  libavdevice    55.  7.100 / 55.  7.100
  libavfilter     4.  1.102 /  4.  1.102
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100
Input #0, mp3, from 'adele.mp3':
  Metadata:
    title           : Chasing Pavements
    artist          : Adele
    track           : 3
    album           : 19 (Deluxe Edition)
    date            : 2008
  Duration: 00:03:30.55, start: 0.025056, bitrate: 160 kb/s
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 159 kb/s
    Stream #0:1: Video: mjpeg, yuvj420p(pc), 600x600 [SAR 72:72 DAR 1:1], 90k tbr, 90k tbn, 90k tbc
    Metadata:
      title           : 
      comment         : Other
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'Ruby on Rails 101- What is Ruby on Rails_.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2013-12-21 07:56:20
  Duration: 00:05:42.40, start: 0.000000, bitrate: 1214 kb/s
    Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720, 1020 kb/s, 30 fps, 30 tbr, 60 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #1:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 191 kb/s (default)
    Metadata:
      creation_time   : 2013-12-21 07:56:23
      handler_name    : IsoMedia File Produced by Google, 5-11-2011
Overriding aspect ratio with stream copy may produce invalid files
Output #0, mp4, to 'test.mp4':
  Metadata:
    title           : Chasing Pavements
    artist          : Adele
    track           : 3
    album           : 19 (Deluxe Edition)
    date            : 2008
    encoder         : Lavf55.29.101
    Stream #0:0(und): Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 1020 kb/s, 30 fps, 15360 tbn, 30 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1: Audio: mp3 (i[0][0][0] / 0x0069), 44100 Hz, stereo, 159 kb/s
Stream mapping:
  Stream #1:0 -> #0:0 (copy)
  Stream #0:0 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame=10272 fps=2793 q=-1.0 Lsize=   46908kB time=00:05:42.40 bitrate=1122.3kbits/s    
video:42642kB audio:4102kB subtitle:0 data:0 global headers:0kB muxing overhead 0.351255

答案1

您可以使用合并平底锅音频过滤器:

ffmpeg -i audio.mp3 -i video.mp4 -filter_complex \
"[0:a][1:a]amerge,pan=stereo|c0<c0+c2|c1<c1+c3[a]" \
-map 1:v -map "[a]" -c:v copy -c:a aac -shortest output.mp4

这将从第一个输入 ( audio.mp3) 和第二个输入 ( video.mp4) 中获取音频流。amerge 会将它们组合成 4 声道流,然后 pan 会将 4 个声道组合成立体声流。输出链接标签名为[out](您可以使用几乎任何任意名称)。

然后-map 1:v选择第二个输入中的视频作为输出文件的视频源,并-map "[a]"过滤图作为输出文件的音频源。

视频流已复制带有-c:v copy,因此不重新编码。过滤器需要重新编码,因此-c:a aac在本例中使用 重新编码为 AAC 音频。

当最短的输入结束时,该-shortest选项将结束输出文件,这在一个输入比另一个输入短时很有用。

答案2

-i 1.mp3 -i res.mp4 -filter_complex [0:a][1:a]amerge,pan=stereo:c0

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