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  1. Hi All, my team had an equipment failure in video recording and I really hope to retrieve /or salvage :'( anything out of the DAT file. Sorry I know very very little about video codec, tried my best to read thru "Video repair tool" FAQ / test all the options / search for "missing audio" in the forum. Your help is greatly appreciated!!!!!!!!!

    Camera was Canon VIXIA HF G30. Also would it help to put original SD card (untouched so far other than copying data) back into the camera? Any caution or tips there?

    When I clicked "scan" in video repair tool, it gave me a 50% playable video (DAT) but no audio. I have tried the following options one at a time:
    • default options: no sound
    • overwrite header: no sound
    • enable AAC / enable PCM: no sound
    • save raw video+audio to files: no files produced
    • enable AVC1 single mode: no sound
    • reencode mp4 same quality: no sound


    mediainfo of original DAT straight from SD card
    General
    Complete name : J:\MVI_3264.DAT
    Format : QuickTime
    Format/Info : Original Apple specifications
    File size : 2.03 GiB
    FileExtension_Invalid : mov qt

    mediainfo of repaired DAT (50%) using default options
    General
    Complete name : J:\MVI_3264.DAT
    Format : MPEG-4
    Format profile : Base Media / Version 2
    Codec ID : mp42 (mp42/avc1/CAEP)
    File size : 1 022 MiB
    Duration : 8 min 43 s
    Overall bit rate mode : Variable
    Overall bit rate : 16.4 Mb/s
    FileExtension_Invalid : mov mp4 m4v m4a m4b m4p m4r 3ga 3gpa 3gpp 3gp 3gpp2 3g2 k3g jpm jpx mqv ismv isma ismt f4a f4b f4v

    Video
    ID : 1
    Format : AVC
    Format/Info : Advanced Video Codec
    Format profile : High@L4
    Format settings : CABAC / 2 Ref Frames
    Format settings, CABAC : Yes
    Format settings, RefFrames : 2 frames
    Format settings, GOP : M=3, N=12
    Codec ID : avc1
    Codec ID/Info : Advanced Video Coding
    Duration : 8 min 43 s
    Bit rate mode : Variable
    Bit rate : 16.4 Mb/s
    Width : 1 920 pixels
    Height : 1 080 pixels
    Display aspect ratio : 16:9
    Frame rate mode : Constant
    Frame rate : 24.000 FPS
    Color space : YUV
    Chroma subsampling : 4:2:0
    Bit depth : 8 bits
    Scan type : Progressive
    Bits/(Pixel*Frame) : 0.329
    Stream size : 1 022 MiB (100%)
    Language : English
    Color range : Limited
    Color primaries : BT.709
    Transfer characteristics : BT.709
    Matrix coefficients : BT.709
    Codec configuration box : avcC

    Audio
    ID : 2
    Format : AAC LC
    Format/Info : Advanced Audio Codec Low Complexity
    Codec ID : mp4a-40-2
    Bit rate mode : Constant
    Nominal bit rate : 256 kb/s
    Channel(s) : 2 channels
    Channel layout : L R
    Sampling rate : 48.0 kHz
    Frame rate : 46.875 FPS (1024 SPF)
    Compression mode : Lossy
    Language : English

    mediainfo of a working mp4 from same camera
    General
    Complete name : J:\MVI_3265.MP4
    Format : MPEG-4
    Format profile : Base Media / Version 2
    Codec ID : mp42 (mp42/avc1/CAEP)
    File size : 3.95 GiB
    Duration : 34 min 5 s
    Overall bit rate : 16.6 Mb/s
    Encoded date : UTC 2019-04-21 11:19:36
    Tagged date : UTC 2019-04-21 11:19:36

    Video
    ID : 1
    Format : AVC
    Format/Info : Advanced Video Codec
    Format profile : High@L4
    Format settings : CABAC / 2 Ref Frames
    Format settings, CABAC : Yes
    Format settings, RefFrames : 2 frames
    Format settings, GOP : M=3, N=12
    Codec ID : avc1
    Codec ID/Info : Advanced Video Coding
    Duration : 34 min 5 s
    Bit rate : 16.3 Mb/s
    Width : 1 920 pixels
    Height : 1 080 pixels
    Display aspect ratio : 16:9
    Frame rate mode : Constant
    Frame rate : 23.976 (24000/1001) FPS
    Color space : YUV
    Chroma subsampling : 4:2:0
    Bit depth : 8 bits
    Scan type : Progressive
    Bits/(Pixel*Frame) : 0.329
    Stream size : 3.89 GiB (98%)
    Language : English
    Encoded date : UTC 2019-04-21 11:19:36
    Tagged date : UTC 2019-04-21 11:19:36
    Color range : Limited
    Color primaries : BT.709
    Transfer characteristics : BT.709
    Matrix coefficients : BT.709
    Codec configuration box : avcC

    Audio
    ID : 2
    Format : AAC LC
    Format/Info : Advanced Audio Codec Low Complexity
    Codec ID : mp4a-40-2
    Duration : 34 min 5 s
    Bit rate mode : Constant
    Bit rate : 256 kb/s
    Channel(s) : 2 channels
    Channel layout : L R
    Sampling rate : 48.0 kHz
    Frame rate : 46.875 FPS (1024 SPF)
    Compression mode : Lossy
    Stream size : 62.1 MiB (2%)
    Language : English
    Encoded date : UTC 2019-04-21 11:19:36
    Tagged date : UTC 2019-04-21 11:19:36

    Other
    ID : 3
    Type : Time code
    Format : QuickTime TC
    Duration : 34 min 5 s
    Time code of first frame : 08:22:58:07
    Time code, striped : Yes
    Language : English
    Encoded date : UTC 2019-04-21 11:19:36
    Tagged date : UTC 2019-04-21 11:19:36
    Bit rate mode : CBR

    Thank you so much in advance!
    Last edited by funlul; 22nd Apr 2019 at 01:25.
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  2. Member
    Join Date
    Mar 2008
    Location
    United States
    Search Comp PM
    I see this in the product manual
    "Memory card A/B writing error Attempt to recover the data? (Can take up to 3 min.)- This message will appear the next time you turn on the camcorder if power supply was accidentally interrupted while the camcorder was writing to the memory card. Select [Recover] to try to recover the recordings. If you inserted a memory card that contains scenes recorded using another device, we recommend that you select [No]"

    Have you tried this?
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  3. Originally Posted by davexnet View Post
    I see this in the product manual
    "Memory card A/B writing error Attempt to recover the data? (Can take up to 3 min.)- This message will appear the next time you turn on the camcorder if power supply was accidentally interrupted while the camcorder was writing to the memory card. Select [Recover] to try to recover the recordings. If you inserted a memory card that contains scenes recorded using another device, we recommend that you select [No]"

    Have you tried this?
    Thank you very much! There was no apparent error message. Camcorder actually recorded 2 more files fine immediately after these 2 bad files.
    But we'll try to insert it back and see whether there is anything.
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  4. Also tried recover_mp4 tool and the video plays fine but audio turned out 95% choppy.
    Image Attached Thumbnails Click image for larger version

Name:	Capture.JPG
Views:	10
Size:	44.3 KB
ID:	48772  

    Click image for larger version

Name:	result capture.JPG
Views:	9
Size:	42.6 KB
ID:	48773  

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  5. OK I consider this particular file more or less saved. The AAC file retrieved by recover_mp4 can be opened in audacity OK. The resulting audio is 16:03 while video is 18:20, but such is life...

    Thank you very much.
    Last edited by funlul; 22nd Apr 2019 at 16:05.
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