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Old 2nd November 2010, 04:19   #1  |  Link
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Extracting Audio from severely damaged MOV

Hi all,

I have a DVCPRO HD .MOV file from a Firestore recorded from an HVX200 that is severely damaged, I can't open it up in anything. I have tried everything from Mpegstreamclip to VLC..nothing will play it.

What I really need to do is extract the audio from it, I dont really care about the video at this point.

I feel like I should be able to do this with FFMPEG. This is where I am so far
Z:\Canon Video\video\broken file>ffmpeg -f dv -i test.mov -map 0:1 -acodec pcm_s16le -ac 2 audio.wav
FFmpeg version SVN-r25512, Copyright (c) 2000-2010 the FFmpeg developers
  built on Oct 18 2010 04:06:45 with gcc 4.4.2
  configuration: --enable-gpl --enable-version3 --enable-libgsm --enable-pthread
s --enable-libvorbis --enable-libtheora --enable-libspeex --enable-libmp3lame --
enable-libopenjpeg --enable-libschroedinger --enable-libopencore_amrwb --enable-
libopencore_amrnb --enable-libvpx --arch=x86 --enable-runtime-cpudetect --enable
-libxvid --enable-libx264 --extra-libs='-lx264 -lpthread' --enable-librtmp --ext
ra-libs='-lrtmp -lpolarssl -lws2_32 -lwinmm' --target-os=mingw32 --enable-avisyn
th --cross-prefix=i686-mingw32- --cc='ccache i686-mingw32-gcc' --enable-memalign
  libavutil     50.32. 3 / 50.32. 3
  libavcore      0. 9. 1 /  0. 9. 1
  libavcodec    52.92. 0 / 52.92. 0
  libavformat   52.83. 0 / 52.83. 0
  libavdevice   52. 2. 2 / 52. 2. 2
  libavfilter    1.52. 0 /  1.52. 0
  libswscale     0.12. 0 /  0.12. 0
[dv @ 01cfcf70] Estimating duration from bitrate, this may be inaccurate
Input #0, dv, from 'test.mov':
  Duration: 00:02:25.79, start: 0.000000, bitrate: 115084 kb/s
    Stream #0.0: Video: dvvideo, yuv422p, 960x720, 115084 kb/s, PAR 4:3 DAR 16:9
, 59.94 tbr, 59.94 tbn, 59.94 tbc
    Stream #0.1: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
    Stream #0.2: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
    Stream #0.3: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
    Stream #0.4: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
Output #0, wav, to 'audio.wav':
    encoder         : Lavf52.83.0
    Stream #0.0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
Stream mapping:
  Stream #0.1 -> #0.0
Press [q] to stop encoding
size=      44kB time=0.23 bitrate=1537.5kbits/s
video:0kB audio:44kB global headers:0kB muxing overhead 0.098162%
All I get is a 44kb wav file.

Anyone have any ideas?

If I don't do the -f dv command I get...."[mov,mp4,m4a,3gp,3g2,mj2 @ 01cfcf60] moov atom not found"
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Old 3rd November 2010, 11:10   #2  |  Link
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Location: Germany
Posts: 5,765
For professional hardware one should also use professional software -> ftp://ftp.panasonic.com/pub/Panasoni...iaComposer.pdf
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Old 7th November 2010, 02:39   #3  |  Link
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Location: Los Angeles
Posts: 5,956
Thats not helpful, Ghitulescu Please don't post just for the sake of posting - per Rule 11.

Ordinarily, DVCProHD stored in a MOV container with PCM audio tracks is total cake for ffmpeg. I've done this plenty of times.

@frubsen: You may be hosed. Did you try something as simple as this:
ffmpeg -f dv -i OMGCORRUPTED.mov -map 0:1 -acodec copy output.wav
Only real change there is I'm asking ffmpeg to just give me whatever audio format the source is, while you explicitly specified the format that ffmpeg recognizes... SHOULDNT make a difference but who knows.

Firestores ... I bet you won't be relying on them again, eh? I've heard more horror stories than I care to think about regarding their stuff, especially the DVCProHD version for the HVX200.

If this is a life and death situation, you can always send the Firestore to a professional data recovery company and see if they can recover any more of the file for you. Not cheap by any means but it might be worth a peek.

These are all my personal statements, not those of my employer :)
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Old 28th November 2010, 04:05   #4  |  Link
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I was able to recover about 3 minutes of the file by using a hex editor and copying the moov header from a working file to the damaged one.

I can work around the missing 2 minutes.

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