[M4IF Technotes] 3gp information please

[Dave Singer]

At 10:54 +0200 3/12/03, Eyal Peleg wrote:
>Hi.
>
>I have a little question for clarifying the issue.
>Basically if I use the ISO encoder for mp4, and save the file with
>.3gp extension, it is a .3gp file?

A pure video file looks right, yes.  Audio may be different, as AMR
is 3g-specific, for example.  Best is to read the specs;  look at
26.234 version 4 on www.3gpp.org, for example, and the mpeg specs
from iso.
>Doesn't the 3gp file have different headers than .mp4?

Not that I can think of.
>
>
>Regards,
>Eyal Peleg
>
>-----Original Message-----
>From: AVARO Olivier FTRD/DIH/REN [mailto:olivier.avaro   rd.francetelecom.com]
>Sent: Wednesday, March 12, 2024 6:06 AM
>To: Nikki Cranley; Technotes   lists.m4if.org
>Subject: RE: [M4IF Technotes] 3gp information please
>
>Dear Nikki,
>
>The .3gp file format is a derivative format from the ISO File Format
>recently standardized jointly  by MPEG and JPEG.
>3GPP supports other codecs than MPEG-4 so they have defined some
>extensions to signal them.
>If you use the same codecs than MPEG-4, you can make a file that is
>both compatible to .3GP and .MP4 by the mean of multiple branding.
>In the interest of interoperability, it is advised to do so.
>
>Kind regards,
>
>O.
>
>
>
>-----Message d'origine-----
>De : Nikki Cranley [mailto:94426082   eeng.dcu.ie]
>EnvoyŽ : mardi 11 mars 2003 11:22
>Ë : Technotes   lists.m4if.org
>Objet : [M4IF Technotes] 3gp information please
>
>Hi All,
>This is the first time Ive heard about .3gp.
>Could anyone tell me where I can find out more about this file format and in
>particular how it differs from mp4.
>Thanking you, regards,
>Nikki
>
>Nikki Cranley,
>Performance Engineering Lab,
>Mobile Multimedia,
>DCU School of Engineering, S220
>UCD Dept. of Computer Science, A006
>*************************************************
>PEL LAB: <http://www.eeng.dcu.ie/~pel/>http://www.eeng.dcu.ie/~pel/
>RESEARCH: <http://www.eeng.dcu.ie/~cranleyn/>http://www.eeng.dcu.ie/~cranleyn/
>ART:
><http://www.eeng.dcu.ie/~cranleyn/art/>http://www.eeng.dcu.ie/~cranleyn/art/
>*************************************************
>
>

--
David Singer
Apple Computer/QuickTime
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