[M4IF Technotes] questions on mp4 file format

[Rob Koenen]

-----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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