[FFmpeg-user] Adding "loop" atom to the video header via FFMPEG

[Vikram Parmar]

You mentioned the presence of "LOOP" atom in apple docs,
https://developer.apple.com/library/content/documentation/QuickTime/QTFF/QTFFChap2/qtff2.html

Could this "loop" be the same thing? If so, how to add this apple movie
atom via ffmpeg?

But the "loop" atom I need would be needed at the start of the file before
the moov atom, I wonder where the apple "LOOP" atom gets headed in the
file...

On 12 Jan 2018 08:15, "Vikram Parmar" <parmar.vikram at gmail.com> wrote:

> Hey Moritz,
>
> Thanks for the detailed reply...
>
> Any other tools you are aware of which would allow adding of custom atoms?
> Those instructions in stackoverflow answer were quite daunting. Woukd
> mp4box help in any way? We are using php, would it be possible to
> add/modify file headers in php?
>
> Also, there is a "beam" atom too before the "loop" atom, is that too a
> custom non standard atom?
>
> Thanks....
>
> On 12 Jan 2018 02:00, "Moritz Barsnick" <barsnick at gmx.net> wrote:
>
>> On Thu, Jan 11, 2018 at 15:33:43 +0530, Vikram Parmar wrote:
>> > Is it possible to add some custom atom in the header of a video file?
>>
>> No, ffmpeg can't add custom or arbitrary atoms.
>>
>> > I need to add the term "loop" in the header of MP4 files before the
>> "moov"
>> > atom.
>> >
>> > More information can be found here :
>> >
>> > https://stackoverflow.com/questions/44893316/whatsapp-video-
>> as-gif-sharing-on-android-programatically
>>
>> That doesn't seem to be a standard atom. I do see mention of a "LOOP"
>> atom here though:
>>
>> https://developer.apple.com/library/content/documentation/Qu
>> ickTime/QTFF/QTFFChap2/qtff2.html
>>
>> > Note: Just opening the video file using any text editor shows the file
>> > header and atoms.
>>
>> AtomicParsley is a nice tool for showing atoms and their hierarchies.
>>
>> > I do not want to edit the headers via too much calculations, as the
>> answer
>> > suggests. Is there a simple FFMPEG command to add the atom "loop" to any
>> > MP4 files?
>>
>> If those instructions work, they're probably scriptable, and you're
>> best off with that.
>>
>> AtomicParsley, while being able to edit atoms, unfortunately doesn't
>> seem to be able to add arbitrary atoms.
>>
>> If the atom was some kind of standard, you could modify ffmpeg to add
>> it (e.g. with an output option similar to the gif muxer's "-loop").
>>
>> > I wish to add some parameter to the above command (or maybe run a
>> separate
>> > command) so that the output mp4 file has that "loop" atom in the header.
>>
>> Someone who knows their way around this fishy atom business ("fishy"
>> just because I'm too stupid to wrap my head around it) could probably
>> implement this in ffmpeg in a breeze. Since, from what I found, it's
>> not even "standard", I doubt it would be accepted for ffmpeg.
>>
>> Moritz
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>