[M4IF Technotes] MP4 files analysis with Dumpster

[David Mackie]

Olivier,
I'm one of the authors of the mpeg4ip package (www.mpeg4ip.net). The package
includes an mp4 file format library that allows modification of anything in
the file. It also includes a number of utilities that use the library,
including an mp4 dumper that understands the MPEG-4 descriptors. If you have
any suggestions for additions to the library we're always glad to receive
them.
Dave Mackie
> -----Original Message-----
> From: technotes-admin   lists.m4if.org
> [mailto:technotes-admin   lists.m4if.org]On Behalf Of Olivier Amato
> Sent: Wednesday, April 17, 2024 4:57 AM
> To: Moreillon Guy; technotes   lists.m4if.org
> Subject: Re: [M4IF Technotes] MP4 files analysis with Dumpster
>
>
> Guy,
>
> > I guess you are referring to Apple's Dumpster program?
>
> Absolutely.
>
> > It does not permit
> > any editing of the file and since it is inteded for QuickTime
> files, is is
> > limited to reading the atom structure and basic quicktime-based
> descriptors.
> > Still, it is usefull for browsing the content of an MP4 file to
> a certain
> > degree, but it won't decode MPEG-4 descriptors (such as iods,
> the Initial
> > Object Descriptor).
>
> Actually, somebody from ResonateMP4 showed me yesterday how to analyze and
> modify an MP4 file ( produced by a company's encoder ) and make
> it playable
> on several players ( DivX, Envivio, Dicas ). I think he just modified the
> time indication of each frame but I'm not sure because I don't know MPEG-4
> specifications deeply enough ( but I can give you his contact if you want
> more informations ... ).
> That's why I'd like to better know what it is possible to do and
> what it is
> not possible to do with Dumpster ...
>
> >   I suggest reading the MPEG-4 standard (14496-1:2001) and looking at
> > mpeg4ip for another dumper.
>
> OK, I'll take a look at mpeg4ip.
> Thanks for your answer.
>
> Regards,
>
> Olivier
>
>
> _______________________________________________
> Technotes mailing list
> Technotes   lists.m4if.org
> http://lists.m4if.org/mailman/listinfo/technotes