Canon R5 DAT (copputed MP4) file recovery Error: bad track: 'free'

[aidolov23]

I will try recovery DAT file from Canon R5 (this file recovering with problems from another software). Untruct show error "Error: bad track: 'free'"

Info: version '' using ffmpeg '3.3.9' Lavc57.89.100
Info: reading /mnt/IMG_3598.MP4
Info: parsing healthy moov atom ...
Info: special track found (tmcd, '')

Info: unknown track 'twos' found -> fallback to dynamic stats
Error: bad track: 'free'

Corrupted DAT file appears instead of MP4 if Canon R5 is turned off while shooting.
I can send corrupted DAT and Good MP4 file if it needs.

[anthwlock]

Hey - please send me the files (healthy+broken) and I will take a look.
You can upload them on wetransfer. If you think they are too big, you can use untrunc -sh file.mp4.
In case you want to keep the link private, you can send me an email - see my Profile page.
Thank you!

[aidolov23]

I sent a link to the uploaded files by email

[anthwlock]

The healthy file has a predictable track order.
However there is some additional padding between the packets (-> 'free' track), which currently confuses untrunc.
Luckily for us, this padding also seems to follow a predictable pattern.

When I have the time, I will do some changes to better handles this.

[vitos1k]

uh, i got exactly the same situation. Canon R5 battery died and i left with DAT file. Untrunc says
Error: bad track: 'free'
is there any chance to save video? I can provide info on the file. However the file is huge 40+Gb i wouldn't be able to send it to you

[anthwlock]

is there any chance to save video?

Yes - it looks promising

[anthwlock]

Ok, I just committed a bunch of changes.

However there is some additional padding between the packets (-> 'free' track), which currently confuses untrunc.

Handling for this got added in 9e03db0

If the recovery ends prematurely, try to use '-s'.

[vitos1k]

it does work! Thanks! It Showed alot of warnings! And only worked with '-s' arg. But video is playing

[aidolov23]

Thanks a lot. The file that I sent as an example was completely restored.

But I also checked my other older corrupted file (also canon r5 *.dat), which I fully restored through another program with audio glitches - in latest Untrunc only the very beginning of the video is restored (I tried with "-s" and without).
It looks like there is not yet a universal fix for Canon Dat files.
But in any case, this is very useful, because there is no exact solution on the Internet on how to fix these canon *.dat files, and I was able to recover only through a paid program. I also found advice to turn to paid services, where they ask for more than $60 for restoring 1 file.

I no longer need to restore files, but I can send other corrupted DAT and Good MP4 files that are not currently being restored, if necessary.

[anthwlock]

but I can send other corrupted DAT and Good MP4 files that are not currently being restored, if necessary

Sure, I might take a look at some point

[aidolov23]

Sure, I might take a look at some point

Sent new link to the uploaded files by email