[M4IF Technotes] File Format Version indication?

[Christopher Wendt]

Hi Richard, all,
Right, ftyp is mandatory for v2,  a file without ftyp is by default v1.
-Chris
----- Original Message -----
From: "Richard Shields" <richard   sorenson.com>
To: "Christopher Wendt" <chris   avipix.com>; <technotes   lists.m4if.org>
Sent: Wednesday, July 11, 2023 1:24 PM
Subject: RE: [M4IF Technotes] File Format Version indication?
> 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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> > > Technotes   lists.m4if.org
> > > http://lists.m4if.org/mailman/listinfo/technotes
> > >
> >
>