FW: [Mp4-tech] authoring mpeg4 content

[Rob Koenen (MPEGIF)]

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Rob
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From: Mikael Bourges-Sevenier [mailto:mikeseven gmail.com] 
Sent: Sunday, 26 February 2024 01:02
To: 'steven godber'; mp4-tech lists.mpegif.org
Subject: RE: [Mp4-tech] authoring mpeg4 content
Dear Steven,
hi all.
i was initially very excited about mpeg4 particularly authored content in
XMT.
i made some experiments in BIFStext and then encoding into mpeg4 using the
open source mp4box. these were fine as experiments go, but the results could
only be played in the osmo4 player. quicktime and realplayer had no idea
what to make of them. 
[Mikael Bourges-Sevenier] 
Osmo4, GPAC, BitManagement should be able to play 2D and 3D contents. 
can someone explain to me some of the more pertinent issues at large here ?
i have been playing with vrml/x3d and would like to migrate this to mpeg4
such as was promised in the original mpeg4 hype (3d graphics, not the
export) but find there are a number of codec/ownership issues here which i
confess i do not totally understand.
[Mikael Bourges-Sevenier] 
XMT and X3D are quite similar as long as you stick with VRML 2.0 features
and don't use the latest X3D features, which may not be available in BIFS.
If you do that then BIFS codecs compliant up to MPEG-4 Systems AMD1
specification will encode your content. You should be able to play it in
GPAC and BitManagement players. There are other players out there, you may
want to google around ;-)
[Mikael Bourges-Sevenier] Also, I think IBM MPEG-4 toolkit should encode
such XMT files with 2D/3D scenes.
how possible is it to actually "author once, play anywhere" and how much is
it going cost 1) me and 2) the user.
[Mikael Bourges-Sevenier] 
With synthetic contents (especially 3D ones) you want to be careful about
the complexity of the scene since from one player to another various
rendering optimizations may or may not be implemented and hence framerate
may vary drastically.
WRT authoring, there are a number of open source tools available out there
e.g. GPAC, MPEG4IP etc. You mentioned VRML/X3D and these are good tools to
start with to create contents, export them to X3D so you can convert them
easily to XMT (you can even write a simple XSLT processor) and use IBM
toolkit or GPAC tools to create mp4 files. Play mp4 files with GPAC or
BitManagement players.
Last but not least, you should try MPEG-4 reference software available from
ISO. Not only it has all the encoders you need but it has 2D/3D players too.
There are of course commercial tools available but I have not used any.
Hope this helps,
Mike
thanks for your help.
steven godber.
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