Audio missing in DAT to MP4 repair

[funlul]

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!

[davexnet]

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?

[funlul]

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.

[funlul]

Also tried recover_mp4 tool and the video plays fine but audio turned out 95% choppy.

[funlul]

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.