[FFmpeg-user] Is it possible to add audio without re-encoding?

[Andrew Gora]

>> Hi,
>> 
>> 
>> There are 30.000 videos converted to H.264 without audio by mistake.
>> 
>> Would you please advice, is it possible to take just audio from
>> original videos and add to the converted ones without re-encoding?
>> 
>> 
>> BIG thanks in advance,
>> Andrew
> 
> Yes. This example will take the first video stream from video.mp4 and
> the first audio stream from audio.mp4 and mux them into out.mp4 without
> re-encoding.
> 
>     ffmpeg -i video.mp4 -i audio.mp4 -map 0:0 -map 1:1 -c copy out.mp4
> 
> You may want to add the "-shortest" option if the durations of the
> video and audio inputs vary for some reason. The -map option has seen
> some syntax updates lately. See Changelog for more detailed information.

Thank You! But something goes wrong, and result file is 0 bytes weight.

00030229.mp4 has audio:

/usr/local/ffmpeg-0.10/bin/ffmpeg -i /farm-video/img_v/mp4/0003/02/00030229.flv -i /farm-video/img_v/mp4/0003/02/00030229.mp4 -map 0:0 -map 1:1 -c copy -y /farm-video/img_v/mp4/0003/02/00030229_1.flv

ffmpeg version 0.10 Copyright (c) 2000-2012 the FFmpeg developers
  built on Jan 30 2012 11:57:43 with gcc 4.4.5 20110214 (Red Hat 4.4.5-6)
  configuration: --prefix=/usr/local/ffmpeg-0.10 --enable-shared --enable-pthreads --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-nonfree --enable-gpl --enable-libmp3lame --enable-libxvid --enable-libvorbis --enable-libfaac --enable-libx264 --enable-avfilter --enable-postproc --enable-version3
  libavutil      51. 34.101 / 51. 34.101
  libavcodec     53. 60.100 / 53. 60.100
  libavformat    53. 31.100 / 53. 31.100
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 60.100 /  2. 60.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0.  6.100 /  0.  6.100
  libpostproc    52.  0.100 / 52.  0.100
[flv @ 0xd8f3a0] Stream discovered after head already parsed
[flv @ 0xd8f3a0] Could not find codec parameters (Audio: none, 0 channels)
Input #0, flv, from '/farm-video/img_v/mp4/0003/02/00030229.flv':
  Metadata:
    lasttimestamp   : 480
    audiosize       : 7632317
    minor_version   : 512
    datasize        : 47072783
    compatible_brands: isomiso2avc1mp41
    totalframes     : 11998
    creation_time   : 1970-01-01 00:00:00
    hasAudio        : true
    hasCuePoints    : false
    hasKeyframes    : true
    hasMetadata     : true
    hasVideo        : true
    metadatacreator : flvtool++ (Facebook, Motion project, dweatherford)
    videosize       : 38936044
    canSeekToEnd    : true
    major_brand     : isom
    encoder         : Lavf53.31.100
  Duration: 00:07:59.92, start: 0.080000, bitrate: 652 kb/s
    Stream #0:0: Audio: none, 0 channels
    Stream #0:1: Video: h264 (Main), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 25 tbr, 1k tbn, 50 tbc
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/farm-video/img_v/mp4/0003/02/00030229.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    creation_time   : 1970-01-01 00:00:00
    encoder         : Lavf52.31.0
  Duration: 00:07:59.88, start: 0.000000, bitrate: 997 kb/s
    Stream #1:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 720x480 [SAR 8:9 DAR 4:3], 864 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc
    Metadata:
      creation_time   : 1970-01-01 00:00:00
      handler_name    : .VideoHandler
    Stream #1:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, s16, 127 kb/s
    Metadata:
      creation_time   : 1970-01-01 00:00:00
      handler_name    : 
[flv @ 0xf5ef60] sample rate not set
Output #0, flv, to '/farm-video/img_v/mp4/0003/02/00030229_1.flv':
  Metadata:
    lasttimestamp   : 480
    audiosize       : 7632317
    minor_version   : 512
    datasize        : 47072783
    compatible_brands: isomiso2avc1mp41
    totalframes     : 11998
    creation_time   : 1970-01-01 00:00:00
    hasAudio        : true
    hasCuePoints    : false
    hasKeyframes    : true
    hasMetadata     : true
    hasVideo        : true
    metadatacreator : flvtool++ (Facebook, Motion project, dweatherford)
    videosize       : 38936044
    canSeekToEnd    : true
    major_brand     : isom
    encoder         : Lavf53.31.100
    Stream #0:0: Audio: none, 0 channels
    Stream #0:1(und): Audio: aac, 44100 Hz, stereo, 127 kb/s
    Metadata:
      creation_time   : 1970-01-01 00:00:00
      handler_name    : 
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #1:1 -> #0:1 (copy)
Could not write header for output file #0 (incorrect codec parameters ?)