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I've been trying fruitlessly for a while now and gotten so frustrated I finally succumbed and decided to ask for help.

I ask though because this file is VERY important, it is also important I know what is wrong. This happened at the camera's end or while the memory card was being transported.

ffprobe reported the following (I gave it a huge maximum analyse duration - spelt with a z because it's American of course :P)

avprobe version 0.8.9-4:0.8.9-0ubuntu0.12.04.1, Copyright (c) 2007-2013 the Libav developers
  built on Nov  9 2013 19:08:00 with gcc 4.6.3
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from [redacted]:
  Metadata:
    major_brand     : 3gp4
    minor_version   : 0
    compatible_brands: 3gp4isom
    creation_time   : 2002-10-29 03:32:30
  Duration: 00:59:59.55, start: 0.000000, bitrate: 135 kb/s
    Stream #0.0(eng): Video: mpeg4, yuv420p, 320x240 [PAR 1:1 DAR 4:3], 69 kb/s, 12.15 fps, 30 tbr, 1k tbn, 30 tbc
    Metadata:
      creation_time   : 2002-10-29 03:32:30
    Stream #0.1(eng): Audio: aac, 16000 Hz, stereo, s16
    Metadata:
      creation_time   : 2002-10-29 03:32:30

Now anything I do (to get ffmpeg/avconf to strip the audio) results in (as in the output from that copy) an audio file that mplayer says contains no audio (just the headers I would guess) and is very small, infact when I try I get the same as the above (output from ffprobe) with this:

Output #0, adts, to 'hope.aac':
  Metadata:
    major_brand     : 3gp4
    minor_version   : 0
    compatible_brands: 3gp4isom
    creation_time   : 2002-10-29 03:32:30
    encoder         : Lavf53.21.1
    Stream #0.0(eng): Audio: aac, 16000 Hz, stereo
    Metadata:
      creation_time   : 2002-10-29 03:32:30
Stream mapping:
  Stream #0:1 -> #0:0 (copy)
Press ctrl-c to stop encoding
size=       0kB time=10000000000.00 bitrate=   0.0kbits/s    
video:0kB audio:0kB global headers:0kB muxing overhead -nan%

I am at my wits end, someone else to whom this file is also very important claims they have:

  • Recovered half of the file's audio
  • Can make out "about 1 word out of every 5"

So that means there is an audio stream there.

Please help me to work out where/why this occurred so at the very least I can stop it happening again, and also (obviously) get what is there out of this file!

BTW the content is much newer than 2002, the Camera's clock is fairly accurate (it has the right year to say the least :P) not sure where it got that from.

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