Corrupt MP4 files

Discussion in 'Camcorders, Action Cams & Video Making Forum' started by DavidLCousins, Jun 10, 2015.

  1. DavidLCousins

    DavidLCousins
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    Hi - I am looking for a miracle worker...

    My family and I returned home from a holiday in Walt Disney World and my SD card in my GoPro has corrupted. I thought something weird had happened when the counter on the camera changed from 122 (clips) to 014. The 14 represents the last 14 videos I shot on the last day, all of which are fine and on my HDD, however I am missing the other 122.

    File recovery software can see the data and recover it, the file sizes look good and additional data seems there, such as resolution, length of video etc. However, none of the videos play in WMP, VLC, QT etc. VLC attempts to play them but it is just a blank screen, no audio/video.

    I'm guessing that the MP4 header is corrupt and I'm in need of someone/somewhere to potentially assist in rebuilding them.

    Any ideas/information would be appreciated as I will be extremely disappointed if I can't get them back.

    Thanks in advance,
    Dave
     
  2. rogs

    rogs
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    How does MediaInfo display the details of the corrupted files?...
     
  3. DavidLCousins

    DavidLCousins
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    Hi rogs,

    Is this the info you want from MediaInfo or something else?

    Format : MPEG-4
    Format profile : Base Media / Version 2
    Codec ID : mp42
    File size : 188 MiB
    Duration : 1mn 43s
    Overall bit rate mode : Constant
    Overall bit rate : 15.2 Mbps
    Encoded date : UTC 2015-05-26 11:41:58
    Tagged date : UTC 2015-05-26 11:41:58
    AMBA :

    Video
    ID : 1
    Format : AVC
    Format/Info : Advanced Video Codec
    Format profile : [email protected]
    Format settings, CABAC : Yes
    Format settings, ReFrames : 4 frames
    Codec ID : avc1
    Codec ID/Info : Advanced Video Coding
    Duration : 1mn 43s
    Bit rate mode : Constant
    Bit rate : 14.6 Mbps
    Width : 1 920 pixels
    Height : 1 080 pixels
    Display aspect ratio : 16:9
    Frame rate mode : Constant
    Frame rate : 25.000 fps
    Color space : YUV
    Chroma subsampling : 4:2:0
    Bit depth : 8 bits
    Scan type : Progressive
    Bits/(Pixel*Frame) : 0.282
    Stream size : 185 MiB (99%)
    Title : GoProa AVC
    Language : English
    Encoded date : UTC 2015-05-26 11:41:58
    Tagged date : UTC 2015-05-26 11:41:58
    Color range : Limited
    Color primaries : BT.709
    Transfer characteristics : BT.709
    Matrix coefficients : BT.709

    Audio
    ID : 2
    Format : AAC
    Format/Info : Advanced Audio Codec
    Format profile : LC
    Codec ID : 40
    Duration : 1mn 43s
    Bit rate mode : Constant
    Bit rate : 128 Kbps
    Channel(s) : 2 channels
    Channel positions : Front: L R
    Sampling rate : 48.0 KHz
    Compression mode : Lossy
    Stream size : 1.58 MiB (1%)
    Title : GoPro AAC
    Language : English
    Encoded date : UTC 2015-05-26 11:41:58
    Tagged date : UTC 2015-05-26 11:41:58
     
  4. DavidLCousins

    DavidLCousins
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    Just to let you know, I have recovered the files! So so so happy! :)
     
  5. rogs

    rogs
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    Looking at how 'intact' the MediaInfo details seemed, it did look hopeful.
    Thanks for letting us know....
     
  6. grahamlthompson

    grahamlthompson
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    Out of interest how did you do this ? The fact that MediaInfo could read the files means there is nothing wrong with the file you opened.

    You most likely couldn't play them simply because your PC lacked the required codecs to play back MP42.
     
  7. DavidLCousins

    DavidLCousins
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    No it wasn't to do with the codecs on my machine, those files were not healthy. When I ran various tools against them to recover the codec, they complained about pixel count issues, missing frames etc etc. When I could get them to play, the sound was off and the movies had been spliced together with a lot of artifacts and juddering.

    So the solution, which isn't really anything I did to be honest:

    I was working with a data recovery company who I linked up with via Sandisk to use their recommended software. I indicated that I was recovering GoPro files and by the time I had completed my first scan I was told that the program I am using wouldn't recover them, they were right. So they recommended another which after a scan looked really promising so I purchased a license. However, they were not recovering the files in a healthy state, as mentioned above. They had been telling me to do a delete or formatted search, but next to those options was an "Explore Volume" option, which is there to look at the healthy filesystem. I expected to see the DCIM -- 100GOPRO directory, with the 14 files, which were there. There was also a FOUND.000 directory with 390 .CHK files, I picked the largest of those, which I knew was a video from Splash Mountain, renamed it to .MP4 and hey presto!

    Extremely lucky I guess that when the card failed to write, it dumped everything out. No other program had seen that directory so I consider this a great £53 well spent.

    The software was called FILERECOVERY by LC Technology.
     
  8. MarkE19

    MarkE19
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    Welcome to the forum DavidLCousins :hiya:

    Well done on recovering your video files, but at £53 it was not a cheap option - although a lot cheaper than going back to America to get the video again, but not as much fun either :p

    Mark.
     
  9. DavidLCousins

    DavidLCousins
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    lol - that is true. Maybe there are cheaper alternatives but I consider it "cheap" in relation to those files being pretty much priceless. Besides, £53 over 120 files is only 44p per file...cheap ;)
     
  10. MarkE19

    MarkE19
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    I like your optimistic view, it makes a nice change :smashin:

    Mark.
     

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