[M4IF Technotes] File Format Version indication?

[Richard Shields]

Hi Chris, all,
Well, my question was prompted by a question to me about 'ftyp'.  'ftyp'
seems to be the information I'm looking for: an indicator that signals which
version the file conforms to.  Is that the correct understanding for it's
use?  Just to make sure I thought I would check to see if there wasn't
anything else in the file that signaled the version.
The document titled "MP4 version 2 (systems amendment 3) working draft"
(w3850.doc) indicates that 'ftyp' is mandatory.  Shouldn't it state that
it's optional?  If it's not there then a player should assume version 1
otherwise consider the version indicated in the 'ftyp' atom.  Would that be
appropriate behavior?
-Richard
> -----Original Message-----
> From: Christopher Wendt [mailto:chris   avipix.com]
> Sent: Wednesday, July 11, 2023 10:59 AM
> To: Richard Shields; technotes   lists.m4if.org
> Subject: Re: [M4IF Technotes] File Format Version indication?
> 
> 
> Hi Richard, all,
> 
> Right now, there is only one version, although version 2 is 
> on it's way.  A
> common problem is the updating of files to correct for the 
> changes in COR1
> to the old spec.  Is that what you mean?
> 
> -Chris
> 
> -------------------------------------------------------------
> Christopher Wendt, avipix, llc
> chris   avipix.com
> (732) 682-5549
> http://www.avipix.com
> 
> ----- Original Message -----
> From: "Richard Shields" <richard   sorenson.com>
> To: <technotes   lists.m4if.org>
> Sent: Wednesday, July 11, 2023 12:30 PM
> Subject: [M4IF Technotes] File Format Version indication?
> 
> 
> > Is there any information in the file format that indicates 
> what version of
> > 14496-1 it complies with?
> >
> > Thanks,
> > Richard
> >
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>