[M4IF Technotes] questions on mp4 file format

[Heat Mist]

On the MPEG4 FAQ, it is written that quicktime format
is the start point of the mp4 file format. So what
exactly is the difference between quicktime format and
mp4 file format in term of the parsing I described in
the previous email? If I have a quicktime parser that
can extract out description information of the video,
can it do the same thing on a mp4 file?
Thanks,
cft
--- Rob Koenen <rkoenen   intertrust.com> wrote:
> -----Original Message-----
> From: Dave Singer [mailto:singer   apple.com]
> Sent: Wednesday, February 06, 2024 11:39
> To: Rob Koenen
> Subject: Re: FW: [M4IF Technotes] questions on mp4
> file format
> 
> 
> Yes, the meta-data and structure parsing is uniform;
>  there are no 
> profiles of the structure of the file format.  In
> addition, finding 
> both the Initial Object Descriptor and all the
> Elementary Stream 
> Descriptors is easy, and so it should be easy to
> determine whether 
> you can decode the media data.
> 
> > -----Original Message-----
> > From: Heat Mist [mailto:heat_mist   yahoo.com]
> > Sent: Wednesday, February 06, 2024 9:08
> > To: technotes   lists.m4if.org
> > Subject: [M4IF Technotes] questions on mp4 file
> format
> > 
> > 
> > Hi, 
> > 
> > I understand that different mpeg4 encoders and
> > decoders can implement different video/audio
> profiles
> > of the standard so that mp4 file encoded by one
> > encoder may not be decoded by another decoder. Is
> it
> > possible to have a mp4 file parser that only
> retrieve
> > metadata information from any mp4 file without
> > decoding the data since the mp4 file structure
> should
> > be the same for every mp4 file?
> > 
> > Thanks,
> > 
> > cft
> > 
> > 
> > 
> > 
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