[FFmpeg-user] Can I repair with ffmpeg a mp4 file where the moov atom is not found ?

[Sandro Di Domenico]

Hello ffmpeg-community,



I want to know if it's possible to repair or to convert a mp4 file where the
moov atom is not found ?

I tried to find all the internet for a solution but I didn't found nothing,
also tried to solve it with various apps.



I read something that is possible to copy the moov atom from a same source
mp4 file tot he broken one but I don't how it works really.



I thank yo indeed for a solution.



Greets

sado

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[Basu A]

Moov atom not found or positioned at the EOF (end of file)?

Thanks and Regards,
Aritrim Basu
[phone]

[If the mobile is not reachable, drop me an email. Often that receives a
faster response.]

Post by Sandro Di Domenico
Hello ffmpeg-community,
I want to know if it's possible to repair or to convert a mp4 file where the
moov atom is not found ?
I tried to find all the internet for a solution but I didn't found nothing,
also tried to solve it with various apps.
I read something that is possible to copy the moov atom from a same source
mp4 file tot he broken one but I don't how it works really.
I thank yo indeed for a solution.
Greets
sado
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[Carl Eugen Hoyos]

Post by Sandro Di Domenico
I want to know if it's possible to repair or to convert a mp4 file
where the moov atom is not found ?

In rare cases, you can do this manually (if you have a similar
file), in other (even more rare) cases, mov files do not have
a moov atom, FFmpeg will not be helpful though.

Carl Eugen
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[Steve Boyer]

Post by Carl Eugen Hoyos

Post by Sandro Di Domenico
I want to know if it's possible to repair or to convert a mp4 file
where the moov atom is not found ?

In rare cases, you can do this manually (if you have a similar
file), in other (even more rare) cases, mov files do not have
a moov atom, FFmpeg will not be helpful though.

Yes, it is possible. The linux program is untrunc, and you might have to
compile it yourself. http://vcg.isti.cnr.it/~ponchio/untrunc.php.
Essentially, it reconstructs it the best it can using the information to go
by off of another MP4 file - it works best if you have a working MP4 file
from the same system/settings.
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[Rob Hallam]

Post by Steve Boyer
Yes, it is possible. The linux program is untrunc, and you might have to
compile it yourself. http://vcg.isti.cnr.it/~ponchio/untrunc.php.
Essentially, it reconstructs it the best it can using the information to go
by off of another MP4 file - it works best if you have a working MP4 file
from the same system/settings.

I suddenly had a use for this, so thank you Steve (and Sandro for
asking the question). The link included 404s, but the project can be
found on GitHub: https://github.com/ponchio/untrunc (with the note
that there is an Arch AUR package!)

(In case anyone is interested: I have been uploading files to Youtube,
and unexpectedly got the error "Upload failed: Can't process file".
For some reason, a couple of the GoPro clips out of the dozen or so I
had been concat-demuxing for upload somehow lost their moov atom
according to ffprobe. Go figure. Since I have similarly-produced
files, untrunc might work. Sadly, I was hit by it's issue #30:
https://github.com/ponchio/untrunc/issues/30 Hey ho.)

Cheers,
Rob
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