Huge video files cannot be opened

[newbie-555]

Hi there,

I'm looking for some support on some huge video files I have.
I assume, it's from my photo camera and I made some mistake generating those enormous files.
Each is round about 25 to 26 GB.
No program I have is able to open these big files.
I have searched for a solution in this forum, tried FFmpeg, tried Handbrake - but possibly I did something wrong using these tools as well, but I couldn't open these files. (e.g. Handbrake saying: moov atom not found).
What can I try to shrink these files, so that I can open them?

Looking forward to any good idea.
Thanks in advance
Newbie

[ProWo]

Try to open it with mediainfo.
If there is displayed any info, post it here.

[newbie-555]

Hi ProWo,

in the sheet view this is what is shown for one of the files:
Count : 349
Count of stream of this kind : 1
Kind of stream : General
Kind of stream : General
Stream identifier : 0
Inform : Count : 349 / Count of stream of this kind : 1 / Kind of stream : General / Kind of stream : General / Stream identifier : 0 / Inform : 24.9 GiB / Complete name : C:\Users\Administrator.PC-PC\Desktop\Fotos\Videos\20210723_165258.mp4 / Folder name : C:\Users\Administrator.PC-PC\Desktop\Fotos\Videos / File name extension : 20210723_165258.mp4 / File name : 20210723_165258 / File extension : mp4 / File size : 26748089920 / File size : 24.9 GiB / File size : 25 GiB / File size : 25 GiB / File size : 24.9 GiB / File size : 24.91 GiB / Stream size : 26748089920 / Stream size : 24.9 GiB (100%) / Stream size : 25 GiB / Stream size : 25 GiB / Stream size : 24.9 GiB / Stream size : 24.91 GiB / Stream size : 24.9 GiB (100%) / Proportion of this stream : 1.00000 / File creation date : 2023-12-22 10:19:45.152 UTC / File creation date (local) : 2023-12-22 11:19:45.152 / File last modification date : 2022-01-04 20:18:58.000 UTC / File last modification date (local) : 2022-01-04 21:18:58.000
Complete name : C:\Users\Administrator.PC-PC\Desktop\Fotos\Videos\20210723_165258.mp4
Folder name : C:\Users\Administrator.PC-PC\Desktop\Fotos\Videos
File name extension : 20210723_165258.mp4
File name : 20210723_165258
File extension : mp4
File size : 26748089920
File size : 24.9 GiB
File size : 25 GiB
File size : 25 GiB
File size : 24.9 GiB
File size : 24.91 GiB
Stream size : 26748089920
Stream size : 24.9 GiB (100%)
Stream size : 25 GiB
Stream size : 25 GiB
Stream size : 24.9 GiB
Stream size : 24.91 GiB
Stream size : 24.9 GiB (100%)
Proportion of this stream : 1.00000
File creation date : 2023-12-22 10:19:45.152 UTC
File creation date (local) : 2023-12-22 11:19:45.152
File last modification date : 2022-01-04 20:18:58.000 UTC
File last modification date (local) : 2022-01-04 21:18:58.000

[davexnet]

Open the file in text view and post that

[TreeTops]

Corrupt file maybe. All those repeated file size listings don't look right. Yes, open mediainfo in text view please.

[newbie-555]

Open the file in text view and post that

Hi davexnet,
strangly enough it now looks a little different - here in text view:
Allgemein
Vollständiger Name : C:\Users\Administrator.PC-PC\Desktop\Fotos\Videos\20210723_165258.mp4
Dateigröße : 24,9 GiB

[newbie-555]

Corrupt file maybe. All those repeated file size listings don't look right. Yes, open mediainfo in text view please.

I tried to repair it using Wondershare repairit, but that threw an error as well.

[davexnet]

Corrupt file maybe. All those repeated file size listings don't look right. Yes, open mediainfo in text view please.

I tried to repair it using Wondershare repairit, but that threw an error as well.

If that's all you got, just those 2 lines, the file is corrupt

[ProWo]

Try the following:

Make a new short video with your phone (10 seconds).

Download untrunc for your system:
https://github.com/anthwlock/untrunc/releases/download/latest/untrunc_x32.zip
or
https://github.com/anthwlock/untrunc/releases/download/latest/untrunc_x64.zip

Unzip it and start untrunc-gui.exe

Follow the instructions in the picture


[Attachment 84038 - Click to enlarge]

[newbie-555]

Try the following:

Make a new short video with your phone (10 seconds).

Download untrunc for your system:
https://github.com/anthwlock/untrunc/releases/download/latest/untrunc_x32.zip
or
https://github.com/anthwlock/untrunc/releases/download/latest/untrunc_x64.zip

Unzip it and start untrunc-gui.exe

Follow the instructions in the picture


[Attachment 84038 - Click to enlarge]

Thanks for this suggestion.
I tried it, but after quite a while it generated a new repaired mp4 with 0 sec.
Here the log of untrunc:
Info: parsing healthy moov atom ...

Warning: no mp4-structure found in: 'C:\Users\Administrator.PC-PC\Desktop\Fotos\Videos\20210723_165258.mp4'
Info: using orig_mdat_start_ (=24)
Info: reading mdat from truncated file ...
Info: using 64-bit offsets for the broken file
[aac @ 000000000278dc60] Number of bands (5) exceeds limit (1).

Error: unable to find correct codec -> premature end (~100%)
try '-s' to skip unknown sequences

Warning: guessed frame durations of 'mp4a' will probably be wrong!
Warning: guessed frame durations of 'avc1' will probably be wrong!
Info: Found 1 packets ( mp4a: 0 avc1: 1 avc1-keyframes: 0 )
Info: Duration of mp4a: (0 ms)
Info: Duration of avc1: 33ms (33 ms)
Info: pruned empty 'mp4a' track
Info: saving C:\Users\Administrator.PC-PC\Desktop\Fotos\Videos\20210723_165258.mp4_fixed. mp4

1 warnings were hidden!

done!