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I'm trying to add sound to a video using ffmpeg, but for some reason, when I play the resulting file, it doesn't have any sound. I also tried doing it with an aac audio file, as well as leaving out -acodec copy and giving it a wav file.

Here is the complete output:

C:\Users\SM-Audio\Desktop>ffmpeg -i PrintingCDs.mp4 -i AudioPrintCDs.mp3 -acodec
 copy -vcodec copy PrintCDs1.mp4
ffmpeg version N-48886-g5ce023b Copyright (c) 2000-2013 the FFmpeg developers
  built on Jan 14 2013 19:16:33 with gcc 4.7.2 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libg
sm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --e
nable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --e
nable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --en
able-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable
-libxavs --enable-libxvid --enable-zlib --enable-filter=frei0r
  libavutil      52. 14.100 / 52. 14.100
  libavcodec     54. 89.100 / 54. 89.100
  libavformat    54. 59.107 / 54. 59.107
  libavdevice    54.  3.102 / 54.  3.102
  libavfilter     3. 32.100 /  3. 32.100
  libswscale      2.  1.103 /  2.  1.103
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'PrintingCDs.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2013-05-01 13:35:52
  Duration: 00:02:35.57, start: 0.000000, bitrate: 585 kb/s
    Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 1024x
768 [SAR 1:1 DAR 4:3], 457 kb/s, 10 fps, 10 tbr, 30k tbn, 30 tbc
    Metadata:
      creation_time   : 2013-05-01 13:35:53
      handler_name    : Mainconcept MP4 Video Media Handler
    Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 22050 Hz, mono, fltp, 126
kb/s
    Metadata:
      creation_time   : 2013-05-01 13:35:53
      handler_name    : Mainconcept MP4 Sound Media Handler
[mp3 @ 003dd6c0] max_analyze_duration 5000000 reached at 5015510 microseconds
Input #1, mp3, from 'AudioPrintCDs.mp3':
  Metadata:
    encoder         : Lavf54.59.107
  Duration: 00:02:36.21, start: 0.000000, bitrate: 64 kb/s
    Stream #1:0: Audio: mp3, 44100 Hz, mono, s16p, 64 kb/s
File 'PrintCDs1.mp4' already exists. Overwrite ? [y/N] y
Output #0, mp4, to 'PrintCDs1.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    encoder         : Lavf54.59.107
    Stream #0:0(eng): Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 1024x768 [S
AR 1:1 DAR 4:3], q=2-31, 457 kb/s, 10 fps, 30k tbn, 30k tbc
    Metadata:
      creation_time   : 2013-05-01 13:35:53
      handler_name    : Mainconcept MP4 Video Media Handler
    Stream #0:1(eng): Audio: aac ([64][0][0][0] / 0x0040), 22050 Hz, mono, 126 k
b/s
    Metadata:
      creation_time   : 2013-05-01 13:35:53
      handler_name    : Mainconcept MP4 Sound Media Handler
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 1555 fps=0.0 q=-1.0 Lsize=   11133kB time=00:02:35.57 bitrate= 586.2kbits
/s
video:8674kB audio:2408kB subtitle:0 global headers:0kB muxing overhead 0.459569
%
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1 Answer

up vote 3 down vote accepted

By default, FFmpeg will only take one audio and one video stream. In your case that's taken from the first file only.

You need to map the streams correctly:

ffmpeg -i input.mp4 -i input.mp3 -c copy -map 0:0 -map 1:0 output.mp4

Here, 0:0 is the first stream of the first file and 1:0 is the first (and only) stream of the second file.

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Thank you very much, that works perfect. What's the -c copy? Is that shorthand for -acodec copy -vcodec copy? –  Arlen Beiler May 1 '13 at 16:52
1  
Yeah, basically it tells it to copy all kinds of streams – this also includes subtitles. –  slhck May 1 '13 at 16:54
    
To see how the streams are named/referenced in your input videos (e.g. if you have a video with multichannel audio), you can just start ffmpeg with one or several input file(s) – and nothing else. Than all the streams are listed and named 0:0, 0:1, 0:2, 1:0, 1:1 and so on. Example: ffmpeg -i videofile.mp4 -i anothervideofile.mp4 –  erik Feb 17 at 15:52
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