[M4IF Technotes] X3D/XMT compatibility

[Mikael Bourges-Sevenier]

There are different flavors of "BIFS text" or BT format. IM1 uses one, ENST
tool another one... with very small differences but enough to make a VRML
syntax compliant parser crash!
At least XML representations (X3D or XMT-A) are standard.
Mike
> -----Original Message-----
> From: technotes-admin   lists.m4if.org 
> [mailto:technotes-admin   lists.m4if.org] On Behalf Of Lyndon J B Nixon
> Sent: Thursday, March 20, 2024 4:11 AM
> To: 'tm991058'
> Cc: technotes   lists.m4if.org
> Subject: Re: [M4IF Technotes] X3D/XMT compatibility
> 
> 
> >
> >
> >     I have already made a test-3d scene and exported it to 
> vrml...than
> >     I converted it to x3d..
> >     The next steps would be to make a xmt file out of the x3d file,
> >     than to get bif out of this and than finaly get a mp4 scene...
> >
> If its only important to you to get from the vrml to mpeg-4, 
> you should 
> note that vrml and the bifs textual format are
> almost exactly the same and you dont need to take this route via XML 
> representations at all.
> If I remember correctly, with bifsenc you need to remove the 
> first line 
> (the vrml header) and then you can pass that file to
> the encoder. There are some syntactic differences between 
> vrml/bifs but 
> I guess encoder error messages can help you with that.
> To get to the actual mp4 file you'll need to generate a mux file of 
> course referencing the generated bif file and passing it through the 
> mp4enc.
> 
> lyndon
> 
> 
> 
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